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Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 2,233,788 $ 2,301,949 $ 2,058,851
Other comprehensive (loss) income, net of tax (7,904) 106,213 (69,554)
Ending balance 1,567,258 2,233,788 2,301,949
Currency Translation [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (69,418)    
Other comprehensive (loss) income, net of tax (36,279)    
Ending balance (105,697) (69,418)  
Unrealized Gain (Loss) on Retirement Plans [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (37,103)    
Other comprehensive (loss) income, net of tax 27,234    
Ending balance (9,869) (37,103)  
Unrealized Gain (Loss) on Investments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (3,546)    
Other comprehensive (loss) income, net of tax 1,141    
Ending balance (2,405) (3,546)  
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (110,067) (216,280) (146,726)
Other comprehensive (loss) income, net of tax (7,904)    
Ending balance $ (117,971) $ (110,067) $ (216,280)