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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income, Net of Tax by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ (12,188) $ (8,969)
Other comprehensive income (loss) before reclassifications 2,941 1,986
Amounts reclassified from accumulated other comprehensive income (230) (968)
Other Comprehensive Income, net of tax 2,711 1,018
Ending balance (9,477) (7,951)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 404 1,932
Other comprehensive income (loss) before reclassifications 1,620 758
Amounts reclassified from accumulated other comprehensive income (285) (1,013)
Other Comprehensive Income, net of tax 1,335 (255)
Ending balance 1,739 1,677
Unrealized Gains (Losses) on Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) before reclassifications 79  
Other Comprehensive Income, net of tax 79  
Ending balance 79  
Defined Benefit Plan Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (5,017) (3,895)
Amounts reclassified from accumulated other comprehensive income 55 45
Other Comprehensive Income, net of tax 55 45
Ending balance (4,962) (3,850)
Foreign Currency Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (7,575) (7,006)
Other comprehensive income (loss) before reclassifications 1,242 1,228
Other Comprehensive Income, net of tax 1,242 1,228
Ending balance $ (6,333) $ (5,778)