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Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 4,689   $ 4,000
Other comprehensive income (loss) before reclassifications, net of tax (11,834) $ 2,417  
Amounts reclassified from accumulated other comprehensive income, net of tax (999) (1,728) (723)
Other comprehensive (loss) income (12,833) 689 (1,820)
Ending balance (8,144) 4,689  
Foreign currency translation reclassification adjustment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications, net of tax (8,759)    
Other comprehensive (loss) income (8,759)    
Ending balance (8,759)    
Unrealized Gains (Losses) on Marketable Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 2,365   1,381
Other comprehensive income (loss) before reclassifications, net of tax (3,075) 2,417  
Amounts reclassified from accumulated other comprehensive income, net of tax (704) (1,433)  
Other comprehensive (loss) income (3,779) 984  
Ending balance (1,414) 2,365  
Retirement Plans Prior Service Credit      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance 2,324   $ 2,619
Amounts reclassified from accumulated other comprehensive income, net of tax (295) (295)  
Other comprehensive (loss) income (295) (295)  
Ending balance $ 2,029 $ 2,324