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Summary of Significant Accounting Policies (Revenue Recognition) - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) Project | Sep. 30, 2015 USD ($) Project | Sep. 30, 2016 USD ($) Project | Sep. 30, 2015 USD ($) Project | Dec. 31, 2015 USD ($)
Revenue Recognition [Line Items] |  |  |  |  |
Revenues | $ 2,042,186,000 | $ 1,939,438,000 | $ 5,548,353,000 | $ 5,673,164,000 |
Percent change in contract estimates impact on operating results is less than this percentage |  | 5.00% | 5.00% | 5.00% |
Increase in operating results due to change in contract estimates, percentage | 6.30% |  |  |  |
Change in contract estimates impact on operating results value gains identified that offset against losses disclosed |  |  |  | $ 11,500,000 |
Number of projects with significant losses | Project | 1 | 2 | 1 | 2 |
Change orders and/or claims | $ 115,600,000 |  | $ 115,600,000 |  | $ 137,200,000
Alaska Power Plant Construction Project [Member] |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Losses on Contracts | 3,000,000 |  | 54,800,000 |  |
Contract value of project | $ 201,000,000 |  | $ 201,000,000 |  |
Project completion percentage | 97.00% |  | 97.00% |  |
Power Plant Project in Alaska and Electric Transmission Project in Canada [Member] |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Losses on Contracts |  | $ 3,700,000 |  | $ 45,000,000 |
Revenue Recognized For Losses Member | Alaska Power Plant Construction Project [Member] |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Revenues |  |  | $ 0 |  |

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