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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance |  |  | $ 249,370 |
Other comprehensive loss before reclassifications: |  |  |  |
Loss on foreign currency translation adjustment | $ (5,897) | $ (563) | (3,444) | $ (10,098)
Amounts reclassified from AOCI: |  |  |  |
Amortization of defined benefit pension actuarial gain | 108 | 116 | 294 | 299
Other comprehensive loss, net of tax | (5,789) | (447) | (3,150) | (9,799)
Ending Balance | 259,663 |  | 259,663 |
Defined Benefit Pension Plan Activity [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (5,687) | (5,832) | (5,873) | (6,015)
Other comprehensive loss before reclassifications: |  |  |  |
Loss on foreign currency translation adjustment | 0 | 0 | 0 | 0
Amounts reclassified from AOCI: |  |  |  |
Amortization of defined benefit pension actuarial gain | 108 | 116 | 294 | 299
Other comprehensive loss, net of tax | 108 | 116 | 294 | 299
Ending Balance | (5,579) | (5,716) | (5,579) | (5,716)
Currency Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (51,257) | (50,960) | (53,710) | (41,425)
Other comprehensive loss before reclassifications: |  |  |  |
Loss on foreign currency translation adjustment | (5,897) | (563) | (3,444) | (10,098)
Amounts reclassified from AOCI: |  |  |  |
Amortization of defined benefit pension actuarial gain | 0 | 0 | 0 | 0
Other comprehensive loss, net of tax | (5,897) | (563) | (3,444) | (10,098)
Ending Balance | (57,154) | (51,523) | (57,154) | (51,523)
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (56,944) | (56,792) | (59,583) | (47,440)
Amounts reclassified from AOCI: |  |  |  |
Ending Balance | $ (62,733) | $ (57,239) | $ (62,733) | $ (57,239)

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