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Summary of Significant Accounting Policies - Revenue Recognition (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Revenue Recognition [Line Items]
Percent increase (decrease) in operating results due to change in contract estimates		6.30%
Change orders and/or claims	$ 115.5		$ 115.5		$ 137.8
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		$ 3.0		$ 54.8

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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=82911808&loc=d3e14326-108349

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
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The amount of costs incurred on unapproved change orders when it is probable that the cost will be recovered through a change in the contract price.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=68065756&loc=d3e49324-109356

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