Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Income Tax Contingency [Line Items]
Beginning balance	$ 34,876
Decrease—Lapse of statute of limitations	(4,309)
Increases	101
Foreign currency translation	925
Ending balance	31,593
Unrecognized Tax Benefits [Member]
Income Tax Contingency [Line Items]
Beginning balance	28,101
Decrease—Lapse of statute of limitations	(2,999)
Foreign currency translation	745
Ending balance	25,847
Interest And Penalties [Member]
Income Tax Contingency [Line Items]
Beginning balance	6,775
Decrease—Lapse of statute of limitations	(1,310)
Increases	101
Foreign currency translation	180
Ending balance	$ 5,746