Income Taxes - Balance Sheet Classification of Net Deferred Income Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Current assets	$ 54,735	$ 50,362
Noncurrent assets	31,386	35,415
Noncurrent liabilities	(106,820)	(137,944)
Net deferred income tax liability	$ (20,699)	$ (52,167)