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Stockholders' Equity - Changes in Accumulated Other Comprehensive Loss, Net of Tax by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 372,944 $ 380,426
Other comprehensive income (loss) before reclassifications (1,920) (2,581)
Amounts reclassified from accumulated other comprehensive income (loss) (36) 1,189
Net current period other comprehensive income (loss) (1,956) (1,392)
Ending Balance 370,375 363,715
ASU 2018-02 [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 385 385
Ending Balance 385 385
Accumulated Other Comprehensive Income [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (11,639) (16,417)
Ending Balance (13,595) (17,809)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 32 (284)
Other comprehensive income (loss) before reclassifications (57) (931)
Amounts reclassified from accumulated other comprehensive income (loss) (135) 1,048
Net current period other comprehensive income (loss) (192) 117
Ending Balance (160) (167)
Defined Benefit Plan Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (9,621) (9,226)
Amounts reclassified from accumulated other comprehensive income (loss) 99 141
Net current period other comprehensive income (loss) 99 141
Ending Balance (9,522) (9,085)
Foreign Currency Adjustments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (2,435) (7,292)
Other comprehensive income (loss) before reclassifications (1,863) (1,650)
Net current period other comprehensive income (loss) (1,863) (1,650)
Ending Balance $ (4,298) $ (8,942)