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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |  |
Loss on contracts |  |  | $ 0 |
Settlement of contract claim |  | $ 0 |  |
Unbilled revenues for unapproved change orders | $ 18,900,000 | 21,600,000 | 18,900,000 |
Claims on uncompleted contracts | 900,000 | 6,000,000 | 900,000 |
Accounts receivable, unapproved contract claims | 300,000 | 0 | 300,000 |
Accounts receivable, contractually billed amounts on contracts related to unapproved contract claims | 52,000,000 | 80,500,000 | 52,000,000 |
Accounts receivable, retainage | 189,200,000 | $ 222,600,000 | 189,200,000 |
Accounts receivable, retainage estimated to be collected in next fiscal year |  | 77.00% |  |
Accounts payable, retainage | 34,600,000 | $ 40,100,000 | 34,600,000 |
Accounts payable, retainage estimated to be paid in next fiscal year |  | 74.00% |  |
Accounts receivable, net | 1,359,862,000 | $ 1,495,431,000 | 1,359,862,000 |
Allowance for doubtful accounts | 11,175,000 | 12,252,000 | 11,175,000 |
Provision for doubtful accounts |  | 6,194,000 | 2,853,000 | $ 2,918,000
Non-cash expense for impairment of property, plant and equipment |  | $ 0 | 0 | $ 0
Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Contract terms |  | 1 month |  |
Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Contract terms |  | 4 years |  |
Machinery and Equipment | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life |  | 3 years |  |
Machinery and Equipment | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life |  | 10 years |  |
Vehicles, Furniture and Fixtures, and Computer Hardware and Software | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life |  | 3 years |  |
Vehicles, Furniture and Fixtures, and Computer Hardware and Software | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life |  | 7 years |  |
Buildings |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Estimated useful life |  | 25 years |  |
United States Mechanical Construction And Facilities Services |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Settlement of contract claim | 12,100,000 |  | 12,100,000 |
Other Current Liabilities |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Insurance liabilities, current | 29,900,000 | $ 42,500,000 | 29,900,000 |
Other Noncurrent Liabilities |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Insurance liabilities, noncurrent | $ 114,300,000 | 167,900,000 | $ 114,300,000 |
Prepaid Expenses and Other |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Anticipated insurance recoveries, current |  | 10,800,000 |  |
Other Assets |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Anticipated insurance recoveries, noncurrent |  | 43,000,000 |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Cumulative adjustment to retained earnings for tax benefits |  | 1,000,000 |  |
Transportation Sector [Member] | United States Electrical Construction And Facilities Services |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Loss on contracts |  | 19,400,000 |  |
Manufacturing Sector [Member] | United States Mechanical Construction And Facilities Services |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Loss on contracts |  | 18,300,000 |  |
Institutional Sector [Member] | United States Mechanical Construction And Facilities Services |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Loss on contracts |  | $ 9,600,000 |  |

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