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Summary of Significant Accounting Policies - Revenue Recognition (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2019 | Jan. 01, 2018 | Dec. 31, 2017
Revenue Recognition [Line Items] |  |  |  |  |
Revenue, remaining performance obligation | $ 5,190,000 |  |  |  |
Change orders and/or claims | 90,400 |  |  |  | $ 144,000
Revenue, related to performance obligation satisfied in previous periods | 26,000 |  |  |  |
Change in contract estimates, impact on operating results, gain (loss) | $ 10,600 | $ (500) |  |  |
Percent aggregate change in contract estimates impact on gross margin | 3.50% | (0.20%) |  |  |
Accounts payable and accrued expenses | $ 1,040,661 |  |  |  | 1,057,460
EPC Electric Transmission Project |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Change in contract estimates, impact on operating results, gain (loss) | 16,800 |  |  |  |
Natural Gas Transmission Project |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Loss on contracts |  | $ 16,500 |  |  |
Retained Earnings | Accounting Standards Update 2014-09 |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Cumulative effect adjustment |  |  |  | $ (1,800) |
Unearned Revenue |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Accounts payable and accrued expenses | $ 17,800 |  |  |  | $ 16,000
Scenario, Forecast |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Revenue, remaining performance obligation expected to be recognized within twelve months |  |  | 80.00% |  |

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