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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |
Loss on contracts | $ 0 |  |
Settlement of contract claim | 18,100,000 | $ 0 |
Unbilled revenues for unapproved change orders | 17,400,000 | 21,600,000 |
Claims on uncompleted contracts | 0 | 6,000,000 |
Accounts receivable, unapproved contract claims | 0 | 0 |
Accounts receivable, contractually billed amounts on contracts related to unapproved contract claims | 57,600,000 | 80,500,000 |
Accounts receivable, retainage | $ 243,500,000 | 222,600,000 |
Accounts receivable, retainage estimated to be collected in next fiscal year | 85.00% |  |
Accounts payable, retainage | $ 41,000,000 | 40,100,000 |
Accounts payable, retainage estimated to be paid in next fiscal year | 88.00% |  |
Accounts receivable, net | $ 1,607,922,000 | 1,495,431,000 |
Allowance for doubtful accounts | 17,230,000 | 12,252,000 |
Provision for doubtful accounts | 7,264,000 | 6,194,000 | $ 2,853,000
Non-cash expense for impairment of property, plant and equipment | 0 | 0 | 0
Non-cash goodwill impairment charge | $ 57,451,000 | 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
Non-cash goodwill impairment charge | $ 0 |  |
United States Electrical Construction And Facilities Services |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Non-cash goodwill impairment charge | 0 |  |
Other Current Liabilities |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Insurance liabilities, current | 47,300,000 | 42,500,000 |
Other Noncurrent Liabilities |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Insurance liabilities, noncurrent | 173,200,000 | 167,900,000 |
Prepaid Expenses and Other |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Anticipated insurance recoveries, current | 14,900,000 | 10,800,000 |
Other Assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Anticipated insurance recoveries, noncurrent | $ 48,600,000 | 43,000,000 |
Accounting Standards Update 2015-17 [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Cumulative effect of change on equity or net assets |  | 41,700,000 |
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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