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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Business Acquisition [Line Items]
Fair value of accounts receivable acquired	$ 14,400	$ 20,600		$ 14,400		$ 20,600
Goodwill acquired				44,610		51,935
Income (loss) from continuing operations before income taxes	128,063		$ 78,133	193,789	$ 228,171
Electric Power Division [Member]
Business Acquisition [Line Items]
Goodwill acquired				24,074
Oil and Gas Infrastructure Division [Member]
Business Acquisition [Line Items]
Goodwill acquired				20,536
Acquisitions 2016 [Member]
Business Acquisition [Line Items]
Goodwill acquired				44,600
Goodwill expected to be deductible for income tax	2,000			2,000
Revenues	24,600			49,100
Income (loss) from continuing operations before income taxes	$ (700)			(1,600)
Acquisitions 2016 [Member] | Electric Power Division [Member]
Business Acquisition [Line Items]
Goodwill acquired				24,100
Acquisitions 2016 [Member] | Oil and Gas Infrastructure Division [Member]
Business Acquisition [Line Items]
Goodwill acquired				$ 20,500
Acquisitions 2015 [Member]
Business Acquisition [Line Items]
Goodwill acquired		4,400
Goodwill expected to be deductible for income tax		$ 34,000				34,000
Acquisitions 2015 [Member] | Electric Power Division [Member]
Business Acquisition [Line Items]
Goodwill acquired						31,500
Acquisitions 2015 [Member] | Oil and Gas Infrastructure Division [Member]
Business Acquisition [Line Items]
Goodwill acquired						$ 20,400

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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