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Summary of Significant Accounting Policies (Goodwill and Other Intangibles) - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Dec. 31, 2015 USD ($) Reporting_Unit	Sep. 30, 2016 USD ($)
Goodwill And Intangible Assets [Line Items]
Non-cash charge for impairment of goodwill	$ 39,800,000	$ 0
Decrease in fair value of reporting units considered for impairment calculation	10.00%
Goodwill	$ 1,552,658,000	1,612,238,000
Intangible assets	205,074,000	197,556,000
Intangible asset impairment charges	$ 12,100,000
Number of reporting units impacted impairment charge | Reporting_Unit	2
Oil and Gas Infrastructure Division, Operating Units that have been Negatively Impacted by Various Factors [Member]
Goodwill And Intangible Assets [Line Items]
Goodwill		127,300,000
Intangible assets		$ 18,600,000

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-Name Accounting Standards Codification
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