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Summary of Significant Accounting Policies (Revenue Recognition) - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) Project | Jun. 30, 2015 USD ($) Project | Jun. 30, 2016 USD ($) Project | Jun. 30, 2015 USD ($) Project | Dec. 31, 2015 USD ($)
Revenue recognized for current period losses [Line Items] |  |  |  |  |
Loss on Contracts | $ 30,500,000 | $ 31,800,000 | $ 51,800,000 | $ 48,200,000 |
Contract value of project | $ 201,000,000 |  | $ 201,000,000 |  |
Project completion percentage | 90.00% |  | 90.00% |  |
Revenues | $ 1,792,430,000 | $ 1,872,340,000 | $ 3,506,167,000 | $ 3,733,726,000 |
Percent change in contract estimates impact on operating results is less than this percentage |  | 5.00% |  | 5.00% |
Decrease in operating results due to change in contract estimates, percentage | 9.20% |  | 6.70% |  |
Change in contract estimates impact on operating results value gains identified that offset against losses disclosed |  | $ 8,500,000 |  | $ 21,000,000 |
Number of projects with significant losses | Project | 1 | 3 | 1 | 3 |
Change orders and/or claims | $ 106,000,000 |  | $ 106,000,000 |  | $ 137,200,000
Alaska Power Plant Construction Project [Member] |  |  |  |  |
Revenue recognized for current period losses [Line Items] |  |  |  |  |
Revenues |  |  | $ 0 |  |

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