Segment and Geographic Information - Reconciliation of Adjusted EBITDA to Net Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting [Abstract]
Adjusted EBITDA									$ 378,753	$ 352,474	$ 322,918
Depreciation									(29,495)	(19,966)	(18,362)
OIBA									349,258	332,508	304,556
Amortization of intangible assets									(5,731)	(6,110)	(7,523)
Stock-based compensation									(48,953)	(30,102)	(17,344)
Spin-Off costs											(6,932)
Other expense, net									(9,872)	(14,321)	(863)
Provision for income taxes									(79,259)	(87,387)	(94,103)
Net income	$ 20,274	$ 55,882	$ 66,988	$ 62,299	$ 33,717	$ 59,535	$ 53,165	$ 48,171	$ 205,443	$ 194,588	$ 177,791