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Accumulated Other Comprehensive Income ("AOCI") - Summary of Total Changes in AOCI by Component, Net of Tax (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ 292,078 |
Other comprehensive income (loss) before reclassifications: |  |  |  |
(Loss) Gain on foreign currency translation adjustment | $ (5,504) | $ 2,949 | (6,022) | $ (8,460)
Amounts reclassified from AOCI: |  |  |  |
Amortization of defined benefit pension actuarial gain | 125 | 75 | 352 | 264
Other comprehensive (loss) gain, net of tax | (5,379) | 3,024 | (5,670) | (8,196)
Ending Balance | 308,790 |  | 308,790 |
Unrecognized Pension Benefit Cost [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (6,477) | (5,482) | (6,704) | (5,671)
Other comprehensive income (loss) before reclassifications: |  |  |  |
(Loss) Gain on foreign currency translation adjustment | 0 | 0 | 0 | 0
Amounts reclassified from AOCI: |  |  |  |
Amortization of defined benefit pension actuarial gain | 125 | 75 | 352 | 264
Other comprehensive (loss) gain, net of tax | 125 | 75 | 352 | 264
Ending Balance | (6,352) | (5,407) | (6,352) | (5,407)
Currency Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (48,365) | (63,091) | (47,847) | (51,682)
Other comprehensive income (loss) before reclassifications: |  |  |  |
(Loss) Gain on foreign currency translation adjustment | (5,504) | 2,949 | (6,022) | (8,460)
Amounts reclassified from AOCI: |  |  |  |
Amortization of defined benefit pension actuarial gain | 0 | 0 | 0 | 0
Other comprehensive (loss) gain, net of tax | (5,504) | 2,949 | (6,022) | (8,460)
Ending Balance | (53,869) | (60,142) | (53,869) | (60,142)
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (54,842) | (68,573) | (54,551) | (57,353)
Amounts reclassified from AOCI: |  |  |  |
Ending Balance | $ (60,221) | $ (65,549) | $ (60,221) | $ (65,549)

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