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Nature of Business - Changes in Accumulated Other Comprehensive (Loss) Income, Net of Tax by Components of Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ 372,944 | $ 380,426 | $ 446,279
Other comprehensive (loss) income before reclassifications | (965) | 4,375 | (2,624)
Amounts reclassified to retained earnings |  |  | 385
Amounts reclassified from accumulated other comprehensive (loss) income | 690 | 403 | 238
Ending Balance | 357,102 | 372,944 | 380,426
ASU 2018-02 [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 385 | 385 |
Amounts reclassified to retained earnings |  |  | 385
Ending Balance | 385 | 385 | 385
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | 32 | (284) | (563)
Other comprehensive (loss) income before reclassifications | (705) | 749 | 573
Amounts reclassified from accumulated other comprehensive (loss) income | 121 | (433) | (294)
Ending Balance | (552) | 32 | (284)
Defined Benefit Plan Adjustments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (9,621) | (9,226) | (8,041)
Other comprehensive (loss) income before reclassifications | 3,439 | (1,231) | (1,717)
Amounts reclassified from accumulated other comprehensive (loss) income | 569 | 836 | 532
Ending Balance | (5,613) | (9,621) | (9,226)
Foreign Currency Adjustments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (2,435) | (7,292) | (5,812)
Other comprehensive (loss) income before reclassifications | (3,699) | 4,857 | (1,480)
Ending Balance | (6,134) | (2,435) | (7,292)
Accumulated Other Comprehensive Income [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (11,639) | (16,417) | (14,416)
Ending Balance | $ (11,914) | $ (11,639) | $ (16,417)

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