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Summary of Significant Accounting Policies - Revenue Recognition (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Retained earnings | $ 2,425,832,000 |  | $ 2,425,832,000 |  |  | $ 2,191,059,000
Remaining performance obligation | 5,290,000,000 |  | 5,290,000,000 |  |  |
Revenues recognized related to change orders and claims | 118,300,000 |  | 118,300,000 |  |  | 144,000,000.0
Revenue, related to performance obligation satisfied in previous periods | 47,200,000 |  | 71,000,000.0 |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results | $ 30,700,000 | $ (2,800,000) | $ (4,600,000) | $ 24,400,000 |  |
Percent aggregate change in contract estimates impact on gross margin | 7.20% | (0.80%) | (0.40%) | 2.70% |  |
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period | $ 32,000,000 |  | $ 375,000,000 |  |  |
Accounts payable and accrued expenses | 1,340,882,000 |  | 1,340,882,000 |  |  | 1,057,460,000
EPC Electric Transmission Project |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results | 47,100,000 |  | 47,200,000 |  |  |
$150 Million Lump-Sum Processing Facility Construction Project |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results | $ (18,800,000) |  | $ (20,600,000) |  |  |
Percentage of completion | 82.00% |  | 82.00% |  |  |
Lump-sum amount | $ 150,000,000 |  | $ 150,000,000 |  |  |
$145 Million Lump Sum Natural Gas Pipeline Construction Project |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results | (10,800,000) |  | (7,600,000) |  |  |
$50 Million Lump Sum Natural Gas Pipeline Construction Project |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Change in contract estimates, favorable (unfavorable) impact on operating results | $ (6,200,000) |  | $ (16,400,000) |  |  |
Percentage of completion | 98.00% |  | 98.00% |  |  |
Lump-sum amount | $ 50,000,000 |  | $ 50,000,000 |  |  |
Unearned Revenue |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Accounts payable and accrued expenses | $ 20,000,000.0 |  | $ 20,000,000.0 |  |  | $ 16,000,000.0
Accounting Standards Update 2014-09 | Adjustment Due to Adoption of New Guidance |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Retained earnings |  |  |  |  | $ (1,800,000) |

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