Deferred Tax Assets (Liabilities) Classified in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Non-current deferred tax assets, net	$ 2,791	$ 2,298
Non-current deferred tax liabilities, net	(141,752)	(22,164)
Net deferred tax liabilities	$ (138,961)	$ (19,866)