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Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance $ 1,480,158 $ 1,522,354 $ 1,953,646
Other comprehensive income (loss) 52,370 (5,814) (29,460)
Balance 2,207,018 1,480,158 1,522,354
Foreign Currency Translation Reclassification Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (23,514) (12,523)  
Other comprehensive loss before reclassifications, net of tax 48,903 (10,991)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax 0 0  
Other comprehensive income (loss) 48,903 (10,991)  
Balance 25,389 (23,514) (12,523)
Unrealized Gains (Losses) on Marketable Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 3,480 (1,845)  
Other comprehensive loss before reclassifications, net of tax 5,839 6,015  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (2,365) (690)  
Other comprehensive income (loss) 3,474 5,325  
Balance 6,954 3,480 (1,845)
Amortization of Prior Service Credit      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance 1,180 1,328  
Other comprehensive loss before reclassifications, net of tax 0 0  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (7) (148) (245)
Other comprehensive income (loss) (7) (148)  
Balance 1,173 1,180 1,328
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance (18,854) (13,040) 18,776
Other comprehensive loss before reclassifications, net of tax 54,742 (4,976)  
Amounts reclassified from accumulated other comprehensive income (loss), net of tax (2,372) (838) 1,092
Other comprehensive income (loss) 52,370 (5,814) (29,460)
Balance $ 33,516 $ (18,854) $ (13,040)