Segments and Geographic Information - Summary of Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total assets	$ 7,411,641	$ 7,502,631
Cash and cash equivalents	517,275	562,884	$ 617,962	$ 729,321
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets	6,856,800	6,900,800
Operating Segments [Member] | CCS [Member]
Segment Reporting Information [Line Items]
Total assets	4,729,100	4,642,000
Operating Segments [Member] | CMS [Member]
Segment Reporting Information [Line Items]
Total assets	2,127,700	2,258,800
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents	517,300	562,900
Deferred income tax assets	$ 37,500	$ 38,900