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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ 497,911  
Other comprehensive income (loss) before reclassifications $ 757 $ 2,834 (2,164) $ 9,045
Amounts reclassified from accumulated other comprehensive income (loss) (1,203) (274) (885) (1,113)
Amounts reclassified to retained earnings     (3,220)  
Other Comprehensive Income (Loss), net of tax (446) 2,560 (6,269) 7,932
Ending Balance 463,601   463,601  
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (741) 2,112 2,567 404
Other comprehensive income (loss) before reclassifications 1,208 1,420 869 4,262
Amounts reclassified from accumulated other comprehensive income (loss) (1,240) (616) (989) (1,750)
Amounts reclassified to retained earnings     (3,220)  
Other Comprehensive Income (Loss), net of tax (32) 804 (3,340) 2,512
Ending Balance (773) 2,916 (773) 2,916
Unrealized Gains (Losses) on Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance   (338)    
Other comprehensive income (loss) before reclassifications   (127)   (619)
Amounts reclassified from accumulated other comprehensive income (loss)   269   423
Other Comprehensive Income (Loss), net of tax   142   (196)
Ending Balance   (196)   (196)
Defined Benefit Plan Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (4,219) (4,876) (4,286) (5,017)
Amounts reclassified from accumulated other comprehensive income (loss) 37 73 104 214
Other Comprehensive Income (Loss), net of tax 37 73 104 214
Ending Balance (4,182) (4,803) (4,182) (4,803)
Foreign Currency Adjustments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (4,158) (3,714) (1,576) (7,575)
Other comprehensive income (loss) before reclassifications (451) 1,541 (3,033) 5,402
Other Comprehensive Income (Loss), net of tax (451) 1,541 (3,033) 5,402
Ending Balance (4,609) (2,173) (4,609) (2,173)
Accumulated Other Comprehensive Income [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (9,118) (6,816) (3,295) (12,188)
Ending Balance $ (9,564) $ (4,256) $ (9,564) $ (4,256)