Income Taxes - Schedule of Accrued Interest and Penalties (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Uncertain tax positions net, excluding interest and penalties	$ (36,019)	$ (49,380)
Accrued interest on uncertain tax positions	(2,651)	(2,743)
Accrued penalties on uncertain tax positions	(16,751)	(39,924)
Uncertain tax positions net, including interest and penalties	$ (55,421)	$ (92,047)