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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 497,911  
Other comprehensive income (loss) before reclassifications $ (3,506) $ 3,270 (2,921) $ 6,211
Amounts reclassified from accumulated other comprehensive income (loss) 191 (609) 318 (839)
Amounts reclassified to retained earnings     (3,220)  
Other Comprehensive Income (Loss), net of tax (3,315) 2,661 (5,823) 5,372
Ending Balance 459,627   459,627  
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (845) 1,739 2,567 404
Other comprehensive income (loss) before reclassifications (82) 1,222 (339) 2,842
Amounts reclassified from accumulated other comprehensive income (loss) 186 (849) 251 (1,134)
Amounts reclassified to retained earnings     (3,220)  
Other Comprehensive Income (Loss), net of tax 104 373 (3,308) 1,708
Ending Balance (741) 2,112 (741) 2,112
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 (loss)   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 (4,224) (4,962) (4,286) (5,017)
Amounts reclassified from accumulated other comprehensive income (loss) 5 86 67 141
Other Comprehensive Income (Loss), net of tax 5 86 67 141
Ending Balance (4,219) (4,876) (4,219) (4,876)
Foreign Currency Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (734) (6,333) (1,576) (7,575)
Other comprehensive income (loss) before reclassifications (3,424) 2,619 (2,582) 3,861
Other Comprehensive Income (Loss), net of tax (3,424) 2,619 (2,582) 3,861
Ending Balance (4,158) (3,714) (4,158) (3,714)
Accumulated Other Comprehensive Income [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (5,803) (9,477) (3,295) (12,188)
Ending Balance $ (9,118) $ (6,816) $ (9,118) $ (6,816)