Segments and Geographic Information - Summary of Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total assets	$ 7,672,907	$ 7,502,631
Cash and cash equivalents	688,368	562,884	$ 735,142	$ 729,321
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total assets	6,944,000	6,900,900
Operating Segments [Member] | CCS [Member]
Segment Reporting Information [Line Items]
Total assets	4,695,700	4,642,000
Operating Segments [Member] | CMS [Member]
Segment Reporting Information [Line Items]
Total assets	2,248,300	2,258,900
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Cash and cash equivalents	688,400	562,900
Deferred income tax assets	$ 40,500	$ 38,800