Income Taxes - Schedule of Reconciliations of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, opening balance	$ 1,927	$ 1,931	$ 1,958
Gross increases – tax positions in prior period	29
Gross increases – current period tax positions	26	20	35
Foreign currency translation	1	69	(43)
Settlement	(1,526)
Lapse of statute of limitations	(289)	(93)	(19)
Unrecognized tax benefits, ending balance	$ 168	$ 1,927	$ 1,931