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Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, $ 1,828,659 $ 1,965,786 $ 2,078,980
Other comprehensive (loss) income before reclassifications, net of tax 39,703 (11,066)  
Amounts reclassified from accumulated other comprehensive income, net of tax (713) (1,004)  
Other comprehensive income (loss) 38,990 (12,070) (12,833)
Balance, 1,953,646 1,828,659 1,965,786
Foreign currency translation reclassification adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, (21,921) (8,759)  
Other comprehensive (loss) income before reclassifications, net of tax 37,840 (13,162)  
Other comprehensive income (loss) 37,840 (13,162)  
Balance, 15,919 (21,921) (8,759)
Unrealized Gains (Losses) on Marketable Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, (60) (1,414)  
Other comprehensive (loss) income before reclassifications, net of tax 1,863 2,037  
Amounts reclassified from accumulated other comprehensive income, net of tax (441) (683)  
Other comprehensive income (loss) 1,422 1,354  
Balance, 1,362 (60) (1,414)
Amortization of prior service credit      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, 1,767 2,029  
Other comprehensive (loss) income before reclassifications, net of tax   59  
Amounts reclassified from accumulated other comprehensive income, net of tax (272) (321) (295)
Other comprehensive income (loss) (272) (262)  
Balance, 1,495 1,767 2,029
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance, (20,214) (8,144) 4,689
Amounts reclassified from accumulated other comprehensive income, net of tax (713) (1,004) (999)
Balance, $ 18,776 $ (20,214) $ (8,144)