Change in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 615,568	$ 591,548
Balance	1,059,768	615,568
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(11,893)	(6,363)
Other comprehensive loss	(3,134)	(5,530)
Balance	$ (15,027)	$ (11,893)