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Revision to Previously Reported Financial Information - Additional Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Increase to retained earnings $ 3,658,158 $ 3,670,543
Increase to retirement obligations and other liabilities 507,970 517,566
Accumulated other comprehensive loss $ (616,200) (609,625)
Foreign Currency Transactions    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Increase to retained earnings   14,000
Increase to retirement obligations and other liabilities   1,000
Accumulated other comprehensive loss   $ (15,000)