Total Lease, Liability, Payments, Year Three Total Lease, Liability, Payments, Year Three Total Lease, Liability, Payments, Year Three Stock Repurchase Program, Authorized Amount Stock Repurchase Program, Authorized Amount Inventory, Work in Process, Gross Inventory, Work in Process, Gross Fixed Charge Coverage Ratio Fixed Charge Coverage Ratio Fixed Charge Coverage Ratio Trademarks and Trade Names [Member] Trademarks and Trade Names [Member] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Current State and Local Tax Expense (Benefit) Current State and Local Tax Expense (Benefit) Contingent consideration Contingent consideration Business Combination, Integration Related Costs Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Comprehensive income (loss) attributable to IES Holdings, Inc. Net income (loss) attributable to IES Holdings, Inc. Net Income (Loss) Attributable to Parent Operating right of use assets Operating Lease, Right-of-Use Asset Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Deferred Tax Assets, Operating Loss Carryforwards Deferred Tax Assets, Operating Loss Carryforwards Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Total Lease, Liability Total Lease, Liability Total Lease, Liability Statistical Measurement [Domain] Statistical Measurement [Domain] Technical Library Other Intangible Assets [Member] Costs and estimated earnings in excess of billings Increase (Decrease) in Contract with Customer, Asset Share-based Payment Arrangement, Nonemployee [Member] Share-based Payment Arrangement, Nonemployee [Member] Security Exchange Name Security Exchange Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Other non-current assets Other non-current assets Other Assets, Noncurrent Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Segments [Axis] Segments [Axis] Accrual for Loss Contingencies, Undiscounted, Fifth Year Loss Contingency, Undiscounted, Fifth Year Loss Contingency, Undiscounted, Fifth Year Retirement Benefits [Abstract] Retirement Benefits [Abstract] NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Entity File Number Entity File Number Non-cash compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Loss (gain) on sale of assets Loss (gain) on sale of assets Gain (Loss) on Disposition of Assets Subsequent Event Type [Domain] Subsequent Event Type [Domain] Revenue Recognition and Deferred Revenue [Abstract] Revenue Recognition and Deferred Revenue [Abstract] Amortization of Intangible Assets Amortization of Intangible Assets Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Periods of Expected Insurance Payments Unusual Risks and Uncertainties [Table Text Block] Variable Lease, Cost Variable Lease, Cost Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Schedule of Inventory, Current [Table Text Block] Schedule of Inventory, Current [Table Text Block] Contract with Customer, Liability, Revenue Recognized Contract with Customer, Liability, Revenue Recognized Subsequent Events [Abstract] Accrual for Loss Contingencies, Undiscounted, Fourth Year Loss Contingency, Undiscounted, Fourth Year Loss Contingency, Undiscounted, Fourth Year Deferred Tax Assets, Net of Valuation Allowance Deferred Tax Assets, Net of Valuation Allowance Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Loss Contingency, Loss in Period Loss Contingency, Loss in Period Income Tax Examination [Table] Income Tax Examination [Table] Total Lease, Liability, Payments, Due After Year Five Total Lease, Liability, Payments, Due After Year Five Total Lease, Liability, Payments, Due After Year Five Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Award Type [Domain] Award Type [Domain] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Local Phone Number Local Phone Number Related Party Transactions [Abstract] Related Party Transactions [Abstract] Decrease (increase) in noncontrolling interest Noncontrolling Interest, Change in Redemption Value Noncontrolling Interest, Change in Redemption Value Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Other non-current liabilities Increase (Decrease) in Other Noncurrent Liabilities Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Intangible Assets Disclosure [Text Block] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Preferred stock, value Preferred Stock, Value, Issued Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Retained Earnings [Member] Retained Earnings [Member] Trade Accounts Receivable Trade Accounts Receivable [Member] Deferred Tax Liabilities, Leasing Arrangements Deferred Tax Liabilities, Leasing Arrangements Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Disclosure [Text Block] Accounts receivable Increase (Decrease) in Accounts Receivable Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Business Acquisition, Pro Forma Information Business Acquisition, Pro Forma Information [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Prepaid expenses and other current assets Increase (Decrease) in Other Current Assets Line of Credit Facility, Remaining Borrowing Capacity Line of Credit Facility, Remaining Borrowing Capacity Earnings (loss) per share, basic Earnings Per Share, Basic Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, to be Paid, Year Three Revenue from External Customers by Products and Services [Table Text Block] Revenue from Contract with Customer [Text Block] Finite-Lived Intangible Assets, Amortization Expense, after Year Five Finite-Lived Intangible Asset, Expected Amortization, after Year Five Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Interest expense Interest Expense, Debt Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Inventory, Raw Materials, Gross Inventory, Raw Materials, Gross Defined Contribution Plan, Cost Defined Contribution Plan, Cost Custom Power Solutions [Member] Custom Power Solutions [Member] Custom Power Solutions [Member] Machinery and Equipment, Gross Machinery and Equipment, Gross Accounts and Other Receivables, Net, Current Accounts and Other Receivables, Net, Current Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Machinery and Equipment [Member] Machinery and Equipment [Member] Operating Lease, Payments Operating Lease, Payments Escrow Deposit Escrow Deposit Deferred Tax Liabilities, Property, Plant and Equipment Deferred Tax Liabilities, Property, Plant and Equipment Bad debt expense Accounts Receivable, Credit Loss Expense (Reversal) Entity Voluntary Filers Entity Voluntary Filers Finance Lease, Right-of-Use Asset, after Accumulated Amortization Finance Lease, Right-of-Use Asset, after Accumulated Amortization Executive Savings Plan assets Assets, Fair Value Disclosure Accrued Insurance, Current Accrued Insurance, Current Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Goodwill impairment expense Impairment expense Goodwill, Impairment Loss Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Entity Small Business Entity Small Business Liquidity Liquidity Liquidity Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Total liabilities and stockholders' equity Liabilities and Equity Other accrued expenses Other Accrued Liabilities, Current Billings in excess of costs and estimated earnings Contract with Customer, Liability, Current Lessee, Operating Lease, Liability, Payments, Due Year Five Lessee, Operating Lease, Liability, to be Paid, Year Five Noncompete Agreements [Member] Noncompete Agreements [Member] Additional paid-in capital Additional Paid in Capital Borrowings of debt Proceeds from Issuance of Long-term Debt and Capital Securities, Net Business Description and Basis of Presentation [Text Block] Business Description and Basis of Presentation [Text Block] Accounts payable and accrued expenses Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Earnings Per Share [Text Block] Earnings Per Share [Text Block] Acquisition of treasury stock Treasury Stock, Value, Acquired, Cost Method Repayments of debt Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security Treasury Stock Acquired, Average Cost Per Share Treasury Stock Acquired, Average Cost Per Share Entity Interactive Data Current Entity Interactive Data Current Share-based Payment Arrangement, Cash Used to Settle Award Share-based Payment Arrangement, Cash Used to Settle Award Finite-Lived Intangible Assets, Amortization Expense, Year Four Finite-Lived Intangible Asset, Expected Amortization, Year Four Other long-term debt Other Long-term Debt, Noncurrent Options exercised Stock Issued During Period, Value, Stock Options Exercised Minimum [Member] Minimum [Member] Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Gross profit Gross profit Gross Profit Lessee, Operating Lease, Liability, Payments, Due Year Two Lessee, Operating Lease, Liability, to be Paid, Year Two Financial and Nonfinancial Liabilities, Fair Value Disclosure Financial and Nonfinancial Liabilities, Fair Value Disclosure Selling, general and administrative expenses Selling, General and Administrative Expense Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Unrecognized Tax Benefits Unrecognized Tax Benefits Unrecognized Tax Benefits Proceeds from sale of assets Proceeds from Sale of Productive Assets Deferred Tax Assets, Gross Deferred Tax Assets, Gross Income Tax Authority [Domain] Income Tax Authority [Domain] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Address, State or Province Entity Address, State or Province Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Lessee, Finance Leases Lessee, Finance Leases [Text Block] Deferred tax assets Deferred Income Tax Assets, Net Total Lease, Liability, Payments, Year Five Total Lease, Liability, Payments, Year Five Total Lease, Liability, Payments, Year Five Cash received (paid) in conjunction with business combinations Cash received (paid) in conjunction with business combinations Payments to Acquire Businesses, Net of Cash Acquired Debt Disclosure [Text Block] Debt Disclosure [Text Block] Shares, Outstanding Shares, Outstanding Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Inventory Disclosure [Text Block] Inventory Disclosure [Text Block] Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Accounting Policies [Abstract] Accounting Policies [Abstract] Auditor Information [Abstract] Auditor Information [Abstract] Auditor Information Current Federal Tax Expense (Benefit) Current Federal Tax Expense (Benefit) Operating Lease, Liability Operating Lease, Liability Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Other Inventory, Gross Other Inventory, Gross Document Transition Report Document Transition Report Common stock, value Common Stock, Value, Issued Finance Lease, Weighted Average Discount Rate, Percent Finance Lease, Weighted Average Discount Rate, Percent Total Lease, Liability, Payments Due Total Lease, Liability, Payments Due Total Lease, Liability, Payment, Due Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Goodwill, Acquired During Period Goodwill, Acquired During Period Performance Based Phantom Shares [Member] Performance Shares [Member] Total Lease, Liability, Undiscounted Excess Amount Total Lease, Liability, Undiscounted Excess Amount Total Lease, Liability, Undiscounted Excess Amount Revolving loan Loans Payable to Bank, Noncurrent Defined Benefit Plan, Funded Percentage Defined Benefit Plan, Funded Percentage Subsequent Event [Table] Subsequent Event [Table] Lessee, Operating Leases Lessee, Operating Leases [Text Block] Entity Emerging Growth Company Entity Emerging Growth Company Finance Lease, Right-of-Use Asset, Amortization Finance Lease, Right-of-Use Asset, Amortization Accounts Receivable, Allowance for Credit Loss, Current Accounts Receivable, Allowance for Credit Loss, Current Loans Payable Loans Payable Accrual for Loss Contingencies, Undiscounted, Third Year Loss Contingency, Undiscounted, Third Year Loss Contingency, Undiscounted, Third Year Cumulative Effect of New Accounting Principle Cumulative Effect of New Accounting Principle Cumulative Effect of New Accounting Principle Business Combination Disclosure [Text Block] Business Combination Disclosure [Text Block] Restricted Stock [Member] Restricted Stock [Member] Compensation and Employee Benefit Plans [Text Block] Compensation and Employee Benefit Plans [Text Block] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Loss Contingency Accrual, Insurance-related Assessment, Discount Rate Loss Contingency Accrual, Insurance-related Assessment, Discount Rate Accounting Standards Update 2016-13 Accounting Standards Update 2016-13 [Member] Auditor Name Auditor Name Cover page. Cover [Abstract] Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Goodwill [Line Items] Goodwill [Line Items] Class of Stock [Axis] Class of Stock [Axis] Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Single Family Contracts [Member] Single Family Contracts [Member] Single Family Type Customer Contracts Treasury Stock, Shares Treasury Stock, Shares Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Summary of Income Tax Contingencies [Table Text Block] Summary of Income Tax Contingencies [Table Text Block] Income Tax Authority [Axis] Income Tax Authority [Axis] Undistributed Earnings (Loss) Available to Common Shareholders, Basic Undistributed Earnings (Loss) Available to Common Shareholders, Basic Unbilled Receivables, Current Unbilled Receivables, Current Payments for Repurchase of Redeemable Noncontrolling Interest Payments for Repurchase of Redeemable Noncontrolling Interest Payments for Repurchase of Redeemable Noncontrolling Interest Performance Obligation Next 12 Months Performance Obligation Next 12 Months Performance Obligation Next 12 Months Multi Family and Other [Member] Multi Family and Other [Member] Multi Family and Other Customer Contract Type Purchases of property and equipment Capital expenditures Payments to Acquire Productive Assets Finance Lease, Liability, Payments, Due after Year Five Finance Lease, Liability, to be Paid, after Year Five Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Finance Lease, Liability, Undiscounted Excess Amount Finance Lease, Liability, Undiscounted Excess Amount Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Equity [Abstract] Equity [Abstract] Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest Finance Lease, Liability, Payments, Due Year Five Finance Lease, Liability, to be Paid, Year Five Common Stock [Member] Common Stock [Member] Finance Lease, Weighted Average Remaining Lease Term Finance Lease, Weighted Average Remaining Lease Term Segment Reporting Disclosure [Text Block] Segment Reporting Disclosure [Text Block] Operating income Operating income (loss) Operating Income (Loss) Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Current operating lease liabilities Operating Lease, Liability, Current Finite-Lived Intangible Assets, Amortization Expense, Year Two Finite-Lived Intangible Asset, Expected Amortization, Year Two Document Fiscal Year Focus Document Fiscal Year Focus Construction Contracts [Member] Customer Contracts [Member] Accrual for Loss Contingencies, Undiscounted, Second Year Loss Contingency, Undiscounted, Second Year Loss Contingency, Undiscounted, Second Year Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Non-cash compensation Share-based Payment Arrangement, Noncash Expense Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Depreciation Depreciation Communications [Member] Communications [Member] Communications [Member] Increase (Decrease) in Deferred Income Taxes Increase (Decrease) in Deferred Income Taxes Treasury Stock [Member] Treasury Stock [Member] Lessee, Total Lease, Liability, Payments, Due Year One Lessee, Total Lease, Liability, Payments, Due in Next Twelve Months Lessee, Total Lease, Liability, Payments, Due in Next Twelve Months Costs and estimated earnings in excess of billings Contract with Customer, Asset, before Allowance for Credit Loss, Current Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Entity Information [Line Items] Entity Information [Line Items] Other (income) expense, net Other Nonoperating Income (Expense) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Operating Loss Carryforwards Attributable To Goodwill Amortization Operating Loss Carryforwards Attributable To Goodwill Amortization Operating Loss Carryforwards Attributable To Goodwill Amortization Business Combinations [Abstract] Business Combinations [Abstract] Line of Credit Facility, Interest Rate at Period End Line of Credit Facility, Interest Rate at Period End Maximum [Member] Maximum [Member] Finance lease payment Proceeds from (Repayments of) Other Long-term Debt Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Total liabilities Liabilities Minimum payments for leases not yet commenced Minimum payments for leases not yet commenced Minimum payments for leases not yet commenced Liability for Claims and Claims Adjustment Expense, Disability, Accident and Health Liability for Claims and Claims Adjustment Expense, Disability, Accident and Health Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Finite-Lived Intangible Asset, Expected Amortization, Year One Award Type [Axis] Award Type [Axis] Lessee, Operating Lease, Liability, Maturity Lessee, Operating Lease, Liability, Maturity [Table Text Block] Total stockholders' equity Stockholders' Equity Attributable to Parent, Beginning Balance Stockholders' Equity Attributable to Parent, Ending Balance Stockholders' Equity Attributable to Parent Stockholders' Equity Attributable to Parent Operating Loss Carryforwards Operating Loss Carryforwards Common Stock, Shares, Issued Common Stock, Shares, Issued City Area Code City Area Code Estimated cost of completion of bonded projects Estimatedcostofcompletionofbondedproject Estimated cost of completion of bonded projects Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Entity Address, City or Town Entity Address, City or Town Other Other Assets, Miscellaneous, Noncurrent Total Lease, Liability, Payments, Year Two Total Lease, Liability, Payments, Year Two Total Lease, Liability, Payments, Year Two Purchase of treasury stock Payments for Repurchase of Common Stock Property, Plant and Equipment, Useful Life Property, Plant and Equipment, Useful Life Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Software and Software Development Costs [Member] Software and Software Development Costs [Member] Land Land Operating long-term lease liabilities Operating Lease, Liability, Noncurrent Finance Lease, Liability, Payment, Due Finance Lease, Liability, Payment, Due Accounting Standards Update [Axis] Accounting Standards Update [Axis] Finance Lease, Liability, Payments, Due Year One Finance Lease, Liability, to be Paid, Year One Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Detail Of Certain Balance Sheet Accounts [Text Block] Detail Of Certain Balance Sheet Accounts [Text Block] Detail Of Certain Balance Sheet Accounts [Text Block] Retained earnings Retained Earnings (Accumulated Deficit) Increase in Unrecognized Tax Benefits is Reasonably Possible Increase in Unrecognized Tax Benefits is Reasonably Possible Income Tax Examination [Line Items] Income Tax Examination [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Entity Filer Category Entity Filer Category Finance Lease, Liability Finance Lease, Liability Deferred Tax Liabilities, Gross Deferred Tax Liabilities, Gross Share Repurchase Program [Axis] Share Repurchase Program [Axis] Income Statement [Abstract] Income Statement [Abstract] Entity Registrant Name Entity Registrant Name Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Finance Lease, Liability, Payments, Due Year Three Finance Lease, Liability, to be Paid, Year Three Finance Lease, Liability, Payments, Due Year Four Finance Lease, Liability, to be Paid, Year Four Issuance of shares Proceeds from Stock Options Exercised Basis of Presentation and Significant Accounting Policies [Text Block] Basis of Presentation and Significant Accounting Policies [Text Block] Finance Lease, Liability, Payments, Due Year Two Finance Lease, Liability, to be Paid, Year Two Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Provision for income taxes Income Tax Expense (Benefit) Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current Amendment Flag Amendment Flag Equity Components [Axis] Equity Components [Axis] Entity Tax Identification Number Entity Tax Identification Number Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Total current assets Assets, Current Distribution to noncontrolling interests Proceeds from (Payments to) Noncontrolling Interests Lessee, Operating Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, to be Paid Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Finance Lease, Cost Finance Lease, Cost Finance Lease, Cost Inventories Inventory, Net Inventory, Net Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table Text Block] Accrued insurance liabilities Accrued Insurance Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Deferred Federal Income Tax Expense (Benefit) Deferred Federal Income Tax Expense (Benefit) Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Lessee, Operating Lease, Liability, Payments, Due after Year Five Lessee, Operating Lease, Liability, to be Paid, after Year Five Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Undistributed Earnings (Loss) Allocated to Participating Securities, Basic Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Business Combination, Contingent Consideration, Liability, Noncurrent Business Combination, Contingent Consideration, Liability, Noncurrent Detail of Certain Balance Sheet Accounts [Abstract] Detail of Certain Balance Sheet Accounts [Abstract] Detail of Certain Balance Sheet Accounts [Abstract] Product and Service [Axis] Product and Service [Axis] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Grantee Status [Axis] Grantee Status [Axis] Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Entity Public Float Entity Public Float Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Equity Component [Domain] Equity Component [Domain] Insurance Related [Member] Insurance Related [Member] Insurance Related Coverage Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Short-term Lease, Cost Short-term Lease, Cost Issuances under compensation plans, shares Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Infrastructure Solutions [Member] Infrastructure Solutions [Member] Infrastructure Solutions [Member] Lessee, Operating Lease, Liability, Payments, Due Year One Lessee, Operating Lease, Liability, to be Paid, Year One Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Accrued compensation and benefits Accrued Salaries Statement [Line Items] Statement [Line Items] Billings in excess of costs and estimated earnings Increase (Decrease) in Contract with Customer, Liability Grantee Status [Domain] Grantee Status [Domain] Securities and equity investments Investments Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Amount Debt Issuance Costs, Noncurrent, Net Debt Issuance Costs, Noncurrent, Net Debt Issuance Costs, Noncurrent, Net Issuances under compensation plans Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Equity Incentive Plan [Member] Equity Incentive Plan [Member] Equity Incentive Plan [Member] Related Party Transaction, Purchases from Related Party Related Party Transaction, Purchases from Related Party Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability Loss Contingency, Undiscounted Amount of Insurance-related Assessment Liability Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, to be Paid, Year Four Time-and-materials Contract [Member] Time-and-materials Contract [Member] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Current finance lease liabilities Finance Lease, Liability, Current Income from operations before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Accounting Standards Update [Domain] Accounting Standards Update [Domain] Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Deferred Tax Assets, Valuation Allowance Deferred Tax Assets, Valuation Allowance Auditor Location Auditor Location Segment Reporting [Abstract] Segment Reporting [Abstract] Finite-Lived Intangible Asset, Useful Life Finite-Lived Intangible Asset, Useful Life Finance Lease, Interest Expense Finance Lease, Interest Expense Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Document Annual Report Document Annual Report Title of 12(b) Security Title of 12(b) Security Total assets Total assets Assets Common Stock, Shares Authorized Common Stock, Shares Authorized Noncontrolling Interest, Period Increase (Decrease) Noncontrolling Interest, Period Increase (Decrease) Document Type Document Type Product and Service [Domain] Product and Service [Domain] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Net (income) loss attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Significant Accounting Policies [Text Block] Significant Accounting Policies [Text Block] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Loss Contingency, Discounted Amount of Insurance-related Assessment Liability Loss Contingency, Discounted Amount of Insurance-related Assessment Liability Schedule of Debt [Table Text Block] Schedule of Debt [Table Text Block] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Furniture and Fixtures [Member] Furniture and Fixtures [Member] Lease, Cost Lease, Cost [Table Text Block] Subsequent Event [Line Items] Subsequent Event [Line Items] Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic Earnings (loss) per share, diluted Earnings Per Share, Diluted State and Local Jurisdiction [Member] State and Local Jurisdiction [Member] Segments [Domain] Segments [Domain] Cash paid for income taxes (net) Income Taxes Paid, Net Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Subsequent Events Subsequent Events [Text Block] Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Intangible Assets, Net (Excluding Goodwill) Corporate Segment [Member] Corporate Segment [Member] Redeemable Noncontrolling Interest, Equity, Redemption Value Redeemable Noncontrolling Interest, Equity, Redemption Value Fixed-price Contract [Member] Fixed-price Contract [Member] Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Treasury stock, value Treasury Stock, Value Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Fair Value Disclosures [Text Block] Fair Value Disclosures [Text Block] Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Accounts Receivable, Allowance for Credit Loss Depreciation and amortization Depreciation, Depletion and Amortization Accrual for Loss Contingencies, Undiscounted, First Year Loss Contingency, Undiscounted, First Year Loss Contingency, Undiscounted, First Year Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Asset, Expected Amortization, Year Three Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Inventories Increase (Decrease) in Inventories Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Cost of services Cost of Goods and Services Sold Document Period End Date Document Period End Date Entity Central Index Key Entity Central Index Key Stock Repurchase Program, Number of Shares Authorized to be Repurchased Stock Repurchase Program, Number of Shares Authorized to be Repurchased Proceeds from Divestiture of Interest in Consolidated Subsidiaries Proceeds from Divestiture of Interest in Consolidated Subsidiaries Deferred State and Local Income Tax Expense (Benefit) Deferred State and Local Income Tax Expense (Benefit) Lease, Cost Lease, Cost Property, Plant and Equipment [Table Text Block] Property, Plant and Equipment [Table Text Block] Investments, Fair Value Disclosure Investments, Fair Value Disclosure Customer Relationships [Member] Customer Relationships [Member] Furniture and Fixtures, Gross Furniture and Fixtures, Gross Loss Contingencies [Line Items] Loss Contingencies [Line Items] Property and equipment, net Property, Plant and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Property, Plant and Equipment Disclosure [Text Block] Other non-current liabilities Other Liabilities, Noncurrent Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount Capitalized Computer Software, Gross Capitalized Computer Software, Gross Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Acquisition of treasury stock, shares Treasury Stock, Shares, Acquired Treasury Stock, Shares, Acquired Trading Symbol Trading Symbol Earnings Per Share [Abstract] Earnings Per Share [Abstract] Share Repurchase Program [Domain] Stock Repurchase Plan [Member] Stock Repurchase Plan Property, Plant and Equipment, Gross Property, Plant and Equipment, Gross Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss, Beginning Accounts Receivable, Allowance for Credit Loss, Ending Accounts Receivable, Allowance for Credit Loss Deferred Tax Liabilities, Other Deferred Tax Liabilities, Other Revenues Revenues Inventory, Finished Goods, Gross Inventory, Finished Goods, Gross Loss Contingency Accrual Loss Contingency Accrual Long-term debt Long-term debt Long-term Debt, Excluding Current Maturities Schedule of Goodwill [Table] Schedule of Goodwill [Table] Share-based Payment Arrangement, Expense Share-based Payment Arrangement, Expense Entity Current Reporting Status Entity Current Reporting Status Accounts payable and accrued expenses Increase (Decrease) in Other Accounts Payable and Accrued Liabilities Entities [Table] Entities [Table] Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Deferred financing cost amortization Amortization of Debt Issuance Costs Cash and cash equivalents CASH, CASH EQUIVALENTS and RESTRiCTED CASH, beginning of period CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Shares, Issued, Beginning Balance Shares, Issued, Ending Balance Shares, Issued Shares, Issued Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share industrial Services [Member] industrial Services [Member] industrial Services [Member] Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross Common Stock, Capital Shares Reserved for Future Issuance Common Stock, Capital Shares Reserved for Future Issuance Leases [Abstract] Leases [Abstract] Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table Text Block] Liability for Claims and Claims Adjustment Expense Liability for Claims and Claims Adjustment Expense Entity Address, Postal Zip Code Entity Address, Postal Zip Code Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Options exercised, shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted ControllingShareholderOwnershipPercentage ControllingShareholderOwnershipPercentage Percentage of outstanding common stock owned by controlling shareholder Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Deferred Tax Assets, Leases Deferred Tax Assets, Leases Deferred Tax Assets, Leases Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Deductions for uncollectible receivables written off, net of recoveries Accounts Receivable, Allowance for Credit Loss, Writeoff Stockholders' Equity Note Disclosure Stockholders' Equity Note Disclosure [Text Block] Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Finite-Lived Intangible Assets, Amortization Expense, Year Five Finite-Lived Intangible Asset, Expected Amortization, Year Five Deferred Tax Assets, Investments Deferred Tax Assets, Investments Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Auditor Firm ID Auditor Firm ID Payments to Acquire Equity Method Investments Payments to Acquire Equity Method Investments Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Entity Address, Address Line One Entity Address, Address Line One Residential [Member] Residential [Member] Residential [Member] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Entity Address, Address Line Two Entity Address, Address Line Two Building and Building Improvements [Member] Building and Building Improvements [Member] Cash paid for interest Interest Paid, Including Capitalized Interest, Operating and Investing Activities Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total Lease, Liability, Payments, Year Four Total Lease, Liability, Payments, Year Four Total Lease, Liability, Payments, Year Four Entity Shell Company Entity Shell Company Purchase Commitment, Remaining Minimum Amount Committed Purchase Commitment, Remaining Minimum Amount Committed Total current liabilities Liabilities, Current Class of Stock [Domain] Class of Stock [Domain] Deferred Tax Liabilities, Goodwill and Intangible Assets Deferred Tax Liabilities, Goodwill and Intangible Assets Finance Lease, Interest Payment on Liability Finance Lease, Interest Payment on Liability Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Accounts payable, trade Accounts Payable, Trade, Current Loss Contingencies [Table] Loss Contingencies [Table] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Current Fiscal Year End Date Current Fiscal Year End Date Accrual for Insurance Loss Contingencies, Undiscounted, after Fifth Year Loss Contingency, Undiscounted, after Fifth Year Loss Contingency, Undiscounted, after Fifth Year Buildings and Improvements, Gross Buildings and Improvements, Gross Statement [Table] Statement [Table] Deferred Tax Assets, Other Deferred Tax Assets, Other Other non-current assets Increase (Decrease) in Other Noncurrent Assets Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Commercial and Industrial [Member] Commercial and Industrial [Member] Commercial and Industrial [Member] Controlling Shareholder [Text Block] Controlling Shareholder [Text Block] Controlling Shareholder [Text Block] Statistical Measurement [Axis] Statistical Measurement [Axis] Subsequent Event Subsequent Event [Member] Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Schedule of Other Assets [Table Text Block] Schedule of Other Assets [Table Text Block] Goodwill Goodwill, beginning Goodwill, ending Goodwill Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Payments for Rent Payments for Rent Construction in Progress, Gross Construction in Progress, Gross Deferred Tax Assets, Capital Loss Carryforwards Deferred Tax Assets, Capital Loss Carryforwards Deferred Tax Assets, Operating Loss Carryforwards, State and Local Deferred Tax Assets, Operating Loss Carryforwards, State and Local Schedule of Goodwill [Table Text Block] Schedule of Goodwill [Table Text Block] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Phantom Share Units (PSUs) [Member] Phantom Share Units (PSUs) [Member] Operating Lease, Cost Operating Lease, Cost Related Party Transactions Disclosure [Text Block] Related Party Transactions Disclosure [Text Block] Operating Leases, Rent Expense Operating Leases, Rent Expense Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Deferred income taxes Deferred Income Tax Expense (Benefit)