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Summary of Significant Accounting Policies - Revenue Recognition (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue Recognition [Line Items] |  |  |
Cumulative adjustment to retained earnings (less than) | $ (2,191,059) | $ (1,876,081) |
Change orders and/or claims | $ 144,000 | $ 137,800 |
Maximum |  |  |
Revenue Recognition [Line Items] |  |  |
Percent aggregate change in contract estimates impact on operating results is less than this percentage | 5.00% | 5.00% | 5.00%
Alaska Power Plant Construction Project |  |  |
Revenue Recognition [Line Items] |  |  |
Losses on contracts |  | $ 54,800 | $ 44,900
Accounting Standards Update 2014-09 | Pro Forma |  |  |
Revenue Recognition [Line Items] |  |  |
Cumulative adjustment to retained earnings (less than) | $ 10,000 |  |

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