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Revenue from Contracts with Customers (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |
Performance obligation satisfied in previous period | $ 0 | $ 7,300,000
Change in estimate of transaction price | 0 | 0
Loss on contracts | 0 |
Unbilled revenues for unapproved change orders | 33,100,000 | 25,200,000
Accounts receivable, unapproved contract claims | 0 | 0
Accounts receivable, contractually billed amounts on contracts related to unapproved contract claims | 89,000,000.0 | 96,100,000
Net billings in excess of costs | 406,552,000 | 359,157,000
Change in net contract liabilities | 51,800,000 |
Change in net billings in excess of costs | 47,400,000 |
Contract asset impairment | 0 |
Accounts receivable, retainage | $ 298,500,000 | 254,600,000
Accounts receivable, retainage estimated to be collected in next fiscal year | 88.00% |
Accounts payable, retainage | $ 64,700,000 | 43,300,000
Accounts payable, retainage estimated to be paid in next fiscal year | 86.00% |
Remaining performance obligations | $ 4,036,364,000 |
2019 Acquisitions |  |
Business Acquisition [Line Items] |  |
Increase (decrease) in contract assets from acquisitions | 8,200,000 |
Increase (decrease) in contract liabilities from acquisitions | $ 29,000,000.0 |
United States Electrical Construction And Facilities Services | Transportation Sector [Member] |  |
Business Acquisition [Line Items] |  |
Loss on contracts |  | $ 10,000,000.0

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- Definition Amount of expense (reversal of expense) for expected credit loss on right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 + Details
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