Stockholders' Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Jun. 30, 2019
Shareholders Equity [Line Items]
Beginning Balance	$ 1,101,848	$ 1,065,466	$ 1,002,593	$ 936,890
Ending Balance	1,182,409	1,101,848	991,457	1,002,593
Foreign Currency Translation Gains (Losses)
Shareholders Equity [Line Items]
Beginning Balance	(15,500)	(16,860)	(12,694)	(15,028)
Other comprehensive income (loss)	2,416	1,360	(5,716)	2,334
Ending Balance	(13,084)	(15,500)	(18,410)	(12,694)
Unrealized Gains on Investments
Shareholders Equity [Line Items]
Beginning Balance	3,427	1,672	939	339
Other comprehensive income (loss)	(814)	1,755	(85)	600
Ending Balance	2,613	3,427	854	939
Gains (Losses) on Derivative Instruments
Shareholders Equity [Line Items]
Beginning Balance	3,538	3,999
Other comprehensive income (loss)	(266)	(461)
Ending Balance	3,272	3,538
Accumulated Other Comprehensive Loss
Shareholders Equity [Line Items]
Beginning Balance	(8,535)	(11,189)	(11,755)	(14,689)
Other comprehensive income (loss)	1,336	2,654	(5,801)	2,934
Ending Balance	$ (7,199)	$ (8,535)	$ (17,556)	$ (11,755)