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Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 1,567,258 $ 2,233,788 $ 2,301,949
Other comprehensive (loss) income, net of tax (1,500) (7,904) 106,213
Ending balance (216,281) 1,567,258 2,233,788
Currency Translation [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (105,697) (69,418)  
Other comprehensive (loss) income, net of tax 1,631 (36,279)  
Ending balance (104,066) (105,697) (69,418)
Unrealized Gain (Loss) on Retirement Plans [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (9,869) (37,103)  
Other comprehensive (loss) income, net of tax (5,536) 27,234  
Ending balance (15,405) (9,869) (37,103)
Unrealized Gain (Loss) on Investments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (2,405) (3,546)  
Other comprehensive (loss) income, net of tax 2,405 1,141  
Ending balance   (2,405) (3,546)
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (117,971) (110,067)  
Other comprehensive (loss) income, net of tax (1,500) (7,904)  
Ending balance $ (119,471) $ (117,971) $ (110,067)