Income Taxes - Reconciliation of Reserve for Uncertain Tax Positions, Excluding Interest and Penalties (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Gross balance at January 1	$ 108,812	$ 115,969	$ 115,009
Additions based on tax positions related to current year	31,022	16,880	2,318
Additions for tax positions of prior years	47,561	12,928	18,906
Reductions for tax positions of prior years	(11,945)	(8)	(7,910)
Expiration of statutes	(1,237)	(2,852)	(2,633)
Reduction due to Spin-off		(26,870)
Tax settlements	(4,526)	(7,235)	(9,721)
Gross balance at December 31	169,687	108,812	115,969
Related tax benefits	(14,369)	(1,064)	(2,038)
Net reserve at December 31	$ 155,318	$ 107,748	$ 113,931