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Beginning Balance, Annual Activity and Ending Balance of each Component of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | $ 305,314 | $ 282,357 | $ 268,326
Balance | 329,230 | 305,314 | 282,357
FX Translation |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | (4,507) | (4,851) | (3,541)
Other comprehensive loss before reclassifications |  | 344 | (1,310)
Balance | $ (4,507) | $ (4,507) | $ (4,851)

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