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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | $ 250,203 | $ 247,021 | $ 249,370 | $ 238,537
Other comprehensive income (loss) before reclassifications: |  |  |  |
Gain (loss) on foreign currency translation adjustment | 1,100 | (13,367) | 2,453 | (9,535)
Amounts reclassified from AOCI: |  |  |  |
Amortization of defined benefit pension actuarial gain | 93 | 92 | 186 | 183
Other comprehensive income (loss), net of tax | 1,193 | (13,275) | 2,639 | (9,352)
Ending Balance | 257,852 | 239,529 | 257,852 | 239,529
Defined Benefit Pension Plan Activity [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (5,780) | (5,924) | (5,873) | (6,015)
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 | 93 | 92 | 186 | 183
Other comprehensive income (loss), net of tax | 93 | 92 | 186 | 183
Ending Balance | (5,687) | (5,832) | (5,687) | (5,832)
Currency Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (52,357) | (37,593) | (53,710) | (41,425)
Other comprehensive income (loss) before reclassifications: |  |  |  |
Gain (loss) on foreign currency translation adjustment | 1,100 | (13,367) | 2,453 | (9,535)
Amounts reclassified from AOCI: |  |  |  |
Amortization of defined benefit pension actuarial gain | 0 | 0 | 0 | 0
Other comprehensive income (loss), net of tax | 1,100 | (13,367) | 2,453 | (9,535)
Ending Balance | (51,257) | (50,960) | (51,257) | (50,960)
Accumulated Other Comprehensive Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Beginning Balance | (58,137) | (43,517) | (59,583) | (47,440)
Amounts reclassified from AOCI: |  |  |  |
Ending Balance | $ (56,944) | $ (56,792) | $ (56,944) | $ (56,792)

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