Income Taxes - Schedule of Accrued Interest and Penalties (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Uncertain tax positions net, excluding interest and penalties	$ (49,380)	$ (50,513)
Accrued interest on uncertain tax positions	(2,743)	(7,503)
Accrued penalties on uncertain tax positions	(39,924)	(37,622)
Uncertain tax positions net, including interest and penalties	$ (92,047)	$ (95,638)