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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Fair value of accounts receivable acquired	$ 14,400	$ 20,600
Goodwill acquired	45,186	51,860
Income (loss) from continuing operations before income taxes	307,686	228,675	$ 426,599
Electric Power Division [Member]
Business Acquisition [Line Items]
Goodwill acquired	24,168	31,224
Oil and Gas Infrastructure Division [Member]
Business Acquisition [Line Items]
Goodwill acquired	21,018	20,636
Acquisitions 2016 [Member]
Business Acquisition [Line Items]
Goodwill acquired	45,200
Goodwill expected to be deductible for income tax	2,000
Revenues	68,500
Income (loss) from continuing operations before income taxes	(5,600)
Acquisition costs	300
Acquisitions 2016 [Member] | Electric Power Division [Member]
Business Acquisition [Line Items]
Goodwill acquired	24,200
Acquisitions 2016 [Member] | Oil and Gas Infrastructure Division [Member]
Business Acquisition [Line Items]
Goodwill acquired	$ 21,000
Acquisitions 2015 [Member]
Business Acquisition [Line Items]
Goodwill expected to be deductible for income tax		34,000
Revenues		104,600
Income (loss) from continuing operations before income taxes		300
Acquisition costs		3,600
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
Acquisitions 2014 [Member]
Business Acquisition [Line Items]
Revenues			314,100
Income (loss) from continuing operations before income taxes			3,400
Acquisition costs			11,600
Acquisitions 2014 [Member] | Electric Power Division [Member]
Business Acquisition [Line Items]
Goodwill acquired			72,300
Acquisitions 2014 [Member] | Oil and Gas Infrastructure Division [Member]
Business Acquisition [Line Items]
Goodwill acquired			$ 94,100

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The capitalized costs incurred during the period (excluded from amortization) to purchase, lease or otherwise acquire an unproved property, including costs of lease bonuses and options to purchase or lease properties, the portion of costs applicable to minerals when land including mineral rights is purchased in fee, brokers' fees, recording fees, legal costs, and other costs incurred in acquiring properties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 10
-Section S99
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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

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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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