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Revenue from Contracts with Customers (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |
Cumulative effect on retained earnings, net of tax | [1] | $ 854,000 |  |
Performance obligation satisfied in previous period |  | 7,300,000 | $ 18,100,000 |
Change in estimate of transaction price |  | 0 | 0 |
Loss on contracts |  |  | 0 |
Unbilled revenues for unapproved change orders |  | 25,200,000 | 17,400,000 |
Accounts receivable, unapproved contract claims |  | 0 | 0 |
Accounts receivable, contractually billed amounts on contracts related to unapproved contract claims |  | 96,100,000 | 57,600,000 |
Net billings in excess of costs |  | 359,157,000 | 401,535,000 |
Change in net contract liabilities |  | 52,700,000 |  |
Change in net billings in excess of costs |  | 42,400,000 |  |
Contract asset impairment |  | 0 |  |
Accounts receivable, retainage |  | $ 254,600,000 | 243,500,000 |
Accounts receivable, retainage estimated to be collected in next fiscal year |  | 86.00% |  |
Accounts payable, retainage |  | $ 43,300,000 | $ 41,000,000 |
Accounts payable, retainage estimated to be paid in next fiscal year |  | 83.00% |  |
Remaining performance obligations |  | $ 3,964,282,000 |  |
2018 Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Increase (decrease) in contract assets from acquisitions |  | 3,800,000 |  |
Increase (decrease) in contract liabilities from acquisitions |  | 9,400,000 |  |
United States Electrical Construction And Facilities Services | Transportation Sector [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Loss on contracts |  | 10,000,000 |  | $ 19,400,000
Accounting Standards Update 2014-09 [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cumulative effect on retained earnings, net of tax |  | $ 900,000 |  |
[1] | Represents adjustment to retained earnings upon the adoption of Accounting Standards Codification Topic 606.

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