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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income, Net of Tax by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 479,517  
Other comprehensive income (loss) before reclassifications $ 3,270 $ (120) 6,211 $ 1,866
Amounts reclassified from accumulated other comprehensive income (609) (624) (839) (1,592)
Other Comprehensive Income (Loss), net of tax 2,661 (744) 5,372 274
Ending Balance 483,363   483,363  
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 1,739 1,677 404 1,932
Other comprehensive income (loss) before reclassifications 1,222 481 2,842 1,239
Amounts reclassified from accumulated other comprehensive income (849) (646) (1,134) (1,659)
Other Comprehensive Income (Loss), net of tax 373 (165) 1,708 (420)
Ending Balance 2,112 1,512 2,112 1,512
Unrealized Gains (Losses) on Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 79      
Other comprehensive income (loss) before reclassifications (571)   (492)  
Amounts reclassified from accumulated other comprehensive income 154   154  
Other Comprehensive Income (Loss), net of tax (417)   (338)  
Ending Balance (338)   (338)  
Defined Benefit Plan Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (4,962) (3,850) (5,017) (3,895)
Amounts reclassified from accumulated other comprehensive income 86 22 141 67
Other Comprehensive Income (Loss), net of tax 86 22 141 67
Ending Balance (4,876) (3,828) (4,876) (3,828)
Foreign Currency Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (6,333) (5,778) (7,575) (7,006)
Other comprehensive income (loss) before reclassifications 2,619 (601) 3,861 627
Other Comprehensive Income (Loss), net of tax 2,619 (601) 3,861 627
Ending Balance (3,714) (6,379) (3,714) (6,379)
Accumulated Other Comprehensive Income [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (9,477) (7,951) (12,188) (8,969)
Ending Balance $ (6,816) $ (8,695) $ (6,816) $ (8,695)