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Summary of Significant Accounting Policies - Goodwill and Other Intangibles (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($) Divisions	Dec. 31, 2016 USD ($) Reporting_Unit
Goodwill And Intangible Assets [Line Items]
Number of internal divisions | Divisions	2
Decrease in fair value of reporting units considered for impairment calculation		10.00%
Number of reporting units with fair values that approximated carrying values | Reporting_Unit		2
Goodwill	$ 1,937,045,000	$ 1,603,169,000
Intangible assets	275,018,000	$ 187,023,000
Non-cash charge for impairment of goodwill	0
Oil and Gas Infrastructure Division, Operating Units that have been Negatively Impacted by Various Factors
Goodwill And Intangible Assets [Line Items]
Goodwill	72,200,000
Intangible assets	$ 11,500,000

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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