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Beginning Balance, Annual Activity and Ending Balance of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance | $ 329,118 | $ 329,230 | $ 314,158 | $ 305,314 | $ 329,230 | $ 305,314
FX translation | 657 | (1,769) | (898) | 672 | (1,112) | (226)
Balance | 333,848 | 329,118 | $ 320,231 | $ 314,158 | 333,848 | $ 320,231
Foreign Currency Translation Adjustments |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Balance | (6,276) | (4,507) |  |  | (4,507) |
FX translation | 657 | (1,769) |  |  |  |
Balance | $ (5,619) | $ (6,276) |  |  | $ (5,619) |

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