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Nature of Business - Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax by Components Of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 380,426 $ 446,279 $ 497,911
Other comprehensive income (loss) before reclassifications 4,375 (2,624) (7,441)
Amounts reclassified to retained earnings   385 (3,220)
Amounts reclassified from accumulated other comprehensive loss 403 238 (460)
Ending Balance 372,944 380,426 446,279
ASU 2018-02 [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 385    
Amounts reclassified to retained earnings   385  
Ending Balance 385 385  
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (284) (563) 2,567
Other comprehensive income (loss) before reclassifications 749 573 685
Amounts reclassified to retained earnings     (3,220)
Amounts reclassified from accumulated other comprehensive loss (433) (294) (595)
Ending Balance 32 (284) (563)
Defined Benefit Plan Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (9,226) (8,041) (4,286)
Other comprehensive income (loss) before reclassifications (1,231) (1,717) (3,890)
Amounts reclassified from accumulated other comprehensive loss 836 532 135
Ending Balance (9,621) (9,226) (8,041)
Foreign Currency Adjustments [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (7,292) (5,812) (1,576)
Other comprehensive income (loss) before reclassifications 4,857 (1,480) (4,236)
Ending Balance (2,435) (7,292) (5,812)
Accumulated Other Comprehensive Income [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (16,417) (14,416) (3,295)
Other comprehensive income (loss) before reclassifications     (7,441)
Ending Balance $ (11,639) $ (16,417) $ (14,416)