Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Provisional income tax expense (benefit)	$ 5,299
Deferred tax asset, provisional income tax expense		$ 13,854
Provisional income tax expense (benefit), adjustment	424
Accumulated foreign earnings, provisional liability		37,132
Transition tax for accumulated foreign earnings, provisional income tax expense	4,875
Operating loss carryforwards	125,013
Operating loss carryforwards, not subject to expiration	89,710
Operating loss carryforwards, subject to expiration	35,303
Unrecognized tax benefits including interest and penalties	20,669	16,919
Unrecognized tax benefits that would impact effective tax rate	14,760	10,847
Interest and penalties paid (received)	18	(3,384)	$ 5
Accrued interest and penalties	$ 2,242	$ 2,151