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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ 268,535 |
Other comprehensive loss before reclassifications: |  |  |  |
(Loss) gain on foreign currency translation adjustment | $ 2,949 | $ (5,897) | (8,460) | $ (3,444)
Amounts reclassified from AOCI: |  |  |  |
Amortization of defined benefit pension actuarial gain | 75 | 108 | 264 | 294
Other comprehensive (income) loss, net of tax | 3,024 | (5,789) | (8,196) | (3,150)
Ending Balance | 279,575 |  | 279,575 |
Unrecognized Pension Benefit Cost [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (5,482) | (5,687) | (5,671) | (5,873)
Other comprehensive 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 | 75 | 108 | 264 | 294
Other comprehensive (income) loss, net of tax | 75 | 108 | 264 | 294
Ending Balance | (5,407) | (5,579) | (5,407) | (5,579)
Currency Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (63,091) | (51,257) | (51,682) | (53,710)
Other comprehensive loss before reclassifications: |  |  |  |
(Loss) gain on foreign currency translation adjustment | 2,949 | (5,897) | (8,460) | (3,444)
Amounts reclassified from AOCI: |  |  |  |
Amortization of defined benefit pension actuarial gain | 0 | 0 | 0 | 0
Other comprehensive (income) loss, net of tax | 2,949 | (5,897) | (8,460) | (3,444)
Ending Balance | (60,142) | (57,154) | (60,142) | (57,154)
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (68,573) | (56,944) | (57,353) | (59,583)
Amounts reclassified from AOCI: |  |  |  |
Ending Balance | $ (65,549) | $ (62,733) | $ (65,549) | $ (62,733)

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