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Accumulated Other Comprehensive Income ("AOCI") - Summary of Total Changes in AOCI by Component, Net of Tax (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ 249,370 |  |
Other comprehensive income before reclassifications: |  |  |
Gain (loss) on foreign currency translation adjustment | 2,028 | $ (12,285) |
Loss on unfunded pension obligations | (195) | (244) | $ (410)
Amounts reclassified from AOCI: |  |  |
Amortization of defined benefit pension actuarial loss | 397 | 386 |
Other comprehensive income (loss), net of tax | 2,230 | (12,143) | 9,929
Ending Balance | 268,535 | 249,370 |
Unrecognized Benefit Cost [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (5,873) | (6,015) |
Other comprehensive income before reclassifications: |  |  |
Gain (loss) on foreign currency translation adjustment | 0 | 0 |
Loss on unfunded pension obligations | (195) | (244) | (410)
Amounts reclassified from AOCI: |  |  |
Amortization of defined benefit pension actuarial loss | 397 | 386 |
Other comprehensive income (loss), net of tax | 202 | 142 |
Ending Balance | (5,671) | (5,873) | (6,015)
Cumulative Translation Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (53,710) | (41,425) |
Other comprehensive income before reclassifications: |  |  |
Gain (loss) on foreign currency translation adjustment | 2,028 | (12,285) |
Loss on unfunded pension obligations | 0 | 0 |
Amounts reclassified from AOCI: |  |  |
Amortization of defined benefit pension actuarial loss | 0 | 0 |
Other comprehensive income (loss), net of tax | 2,028 | (12,285) |
Ending Balance | (51,682) | (53,710) | (41,425)
Accumulated Other Comprehensive Loss [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (59,583) | (47,440) |
Amounts reclassified from AOCI: |  |  |
Ending Balance | $ (57,353) | $ (59,583) | $ (47,440)

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