Other Comprehensive Income - Changes in Accumulated Other Comprehensive (Loss) Income by Component (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 1,944,823	$ 1,981,478
Reclassification adjustment for foreign currency translation included in net income	2,683	0
Ending Balance	2,171,604	$ 1,967,478
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(2,682)
Other comprehensive loss before reclassifications	(1)
Reclassification adjustment for foreign currency translation included in net income	2,683
Net current-period other comprehensive income	2,682
Ending Balance	$ 0