Changes in Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance, Amount	$ 762,655	$ 649,958
Other comprehensive (loss) income before reclassifications	(5,942)	4,939
Ending Balance, Amount	873,799	762,655
Cumulative Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance, Amount	4,180	(610)
Other comprehensive (loss) income before reclassifications	(4,712)	4,790
Ending Balance, Amount	(532)	4,180
Unrealized Gain (Loss) on Investments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance, Amount	423	274
Other comprehensive (loss) income before reclassifications	(1,230)	149
Ending Balance, Amount	(807)	423
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance, Amount	4,603	(336)
Ending Balance, Amount	$ (1,339)	$ 4,603