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Summary of Significant Accounting Policies - Revenue Recognition (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Revenue Recognition [Line Items] |  |  |  |  |
Percent increase (decrease) in operating results due to change in contract estimates | 10.20% | (9.20%) |  | (6.70%) |
Change in contract estimates | $ 24.6 |  |  |  |
Change orders and/or claims | $ 118.9 |  | $ 118.9 |  | $ 137.8
Maximum |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Percent aggregate change in contract estimates impact on operating results is less than this percentage |  |  | 5.00% |  |
Alaska Power Plant Construction Project |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |
Losses on contracts |  | $ 30.5 |  | $ 51.8 |

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