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Summary of Significant Accounting Policies (Revenue Recognition) - Additional Information (Detail) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Revenue Recognition [Line Items] |  |  |
Revenues | $ 2,178,170,000 | $ 1,713,737,000 |
Project completion percentage | 85.00% |  |
Change orders and/or claims | $ 147,100,000 |  | $ 137,800,000
Maximum [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Percent aggregate change in contract estimates impact on operating results is less than this percentage | 5.00% | 5.00% |
Natural Gas Transmission Project That Experienced Weather Delays [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Losses on Contracts | $ 16,500,000 |  |
Alaska Power Plant Construction Project [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Losses on Contracts |  | $ 21,300,000 |
Revenue Recognized For Losses Member | Natural Gas Transmission Project That Experienced Weather Delays [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Revenues | $ 0 |  |

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- Definition Losses recognized in the current period on contracts which are expected to generate losses, which are probable and can be reasonably estimated, in a future period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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