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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Detail) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2017 USD ($) Reporting_Unit	Dec. 31, 2015 USD ($) Reporting_Unit	Dec. 31, 2017 USD ($) Divisions Reporting_Unit	Dec. 31, 2016 USD ($)	Dec. 31, 2015 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%		10.00%
Goodwill	$ 1,868,600	$ 1,552,658	$ 1,868,600	$ 1,603,169	$ 1,552,658
Intangible assets	263,179		263,179	187,023
Market capitalization	6,020,000		6,020,000
Stockholders' equity	$ 3,791,571		$ 3,791,571	$ 3,339,427
Number of reporting units impacted by impairment charge | Reporting_Unit	2	2	2		2
Non-cash charge for impairment of goodwill	$ 57,000	$ 39,800	$ 57,011
Intangible asset impairment charges	1,100	$ 12,100	$ 1,100		$ 12,100
Minimum
Goodwill And Intangible Assets [Line Items]
Reporting units growth rates			(14.00%)
Discount rates			17.00%	20.00%	18.00%
Customer attrition rates			15.00%	10.00%	14.00%
Maximum
Goodwill And Intangible Assets [Line Items]
Reporting units growth rates			17.00%
Discount rates			25.00%	23.00%	22.00%
Customer attrition rates			78.00%	70.00%	70.00%
Oil and Gas Infrastructure Division, Operating Units that have been Negatively Impacted by Various Factors
Goodwill And Intangible Assets [Line Items]
Goodwill	50,100		$ 50,100
Intangible assets	$ 14,700		$ 14,700

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