Income Taxes - Significant Components of Deferred Income Tax Assets and Liabilities Classified (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Deferred income taxes, current	$ 7,814	$ 6,448
Deferred income taxes, non-current	(31,522)	(21,303)
Net deferred tax liability	$ (23,708)	$ (14,855)