Schedule of Uncertain Tax Positions and Income Tax Payable (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax liabilities for uncertain tax positions	$ 43,790	$ 31,694
Income tax payable	9,387	12,492
Income tax (receivable)	$ (9,245)	$ (8,442)