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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ 292,078 |
Other comprehensive income (loss) before reclassifications: |  |  |  |
Gain (loss) on foreign currency translation adjustment | $ 4,311 | $ 5,472 | (518) | $ (11,409)
Amounts reclassified from AOCI: |  |  |  |
Amortization of defined benefit pension actuarial gain | 113 | 91 | 227 | 189
Net current period other comprehensive income (loss) | 4,424 | 5,563 | (291) | (11,220)
Ending Balance | 303,632 |  | 303,632 |
Unrecognized Pension Benefit Cost [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (6,590) | (5,573) | (6,704) | (5,671)
Other comprehensive income (loss) before reclassifications: |  |  |  |
Gain (loss) on foreign currency translation adjustment | 0 | 0 | 0 | 0
Amounts reclassified from AOCI: |  |  |  |
Amortization of defined benefit pension actuarial gain | 113 | 91 | 227 | 189
Net current period other comprehensive income (loss) | 113 | 91 | 227 | 189
Ending Balance | (6,477) | (5,482) | (6,477) | (5,482)
Currency Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (52,676) | (68,563) | (47,847) | (51,682)
Other comprehensive income (loss) before reclassifications: |  |  |  |
Gain (loss) on foreign currency translation adjustment | 4,311 | 5,472 | (518) | (11,409)
Amounts reclassified from AOCI: |  |  |  |
Amortization of defined benefit pension actuarial gain | 0 | 0 | 0 | 0
Net current period other comprehensive income (loss) | 4,311 | 5,472 | (518) | (11,409)
Ending Balance | (48,365) | (63,091) | (48,365) | (63,091)
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (59,266) | (74,136) | (54,551) | (57,353)
Amounts reclassified from AOCI: |  |  |  |
Ending Balance | $ (54,842) | $ (68,573) | $ (54,842) | $ (68,573)

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