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Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Repayments of debt Repayment of Long-Term Debt, Long-Term Lease Obligation, and Capital Security Long-term debt Long-Term Debt, Excluding Current Maturities Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable Accounts Receivable, after Allowance for Credit Loss, Current NEXT Electric NEXT Electric [Member] NEXT Electric LLC Retained earnings Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Equity Securities, FV-NI Equity Securities, FV-NI Redeemable Noncontrolling Interest [Axis] Redeemable Noncontrolling Interest [Axis] Redeemable Noncontrolling Interest Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension 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Cover [Abstract] Equity Awards Adjustments Equity Awards Adjustments [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Total liabilities and stockholders' equity Liabilities and Equity Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Share-Based Payment Arrangement, Option Share-Based Payment Arrangement, Option [Member] Noncontrolling interest Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Plan Name [Axis] Plan Name [Axis] Debt Securities, Trading Debt Securities, Trading Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Tabular List, Table Tabular List 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(benefit from) income taxes Income Tax Expense (Benefit) us-gaap_PhantomShareUnitsPSUsMember_Employees Phantom Share Units, Employee PSUs [Member] Phantom Share Units, Employee PSUs Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Commitments Commitments [Member] Commercial and Industrial [Member] Commercial and Industrial [Member] Commercial and Industrial [Member] Controlling Shareholder [Text Block] Controlling Shareholder [Text Block] Controlling Shareholder [Text Block] Cost of services Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount Business Combination, Contingent Consideration, Range of Outcomes, Maximum, Amount Time-and-materials Contract [Member] 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