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Other Comprehensive Income - Changes in Accumulated Other Comprehensive (Loss) Income Related to Foreign Currency Items (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance $ 2,171,604 $ 1,967,478 $ 1,944,823 $ 1,981,478
Reclassification adjustment for foreign currency translation included in net income 0 0 2,683 0
Ending Balance 2,017,031 $ 1,959,804 2,017,031 $ 1,959,804
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   $ 0