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Accumulated Other Comprehensive Income - Components of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance |  | $ 296,608 |
Other comprehensive income |  | 1,482 |
Income taxes | $ (432) | (432) | $ (900)
Ending Balance | 319,846 | 319,846 |
Currency Translation Adjustments [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance |  | (563) |
Other comprehensive income |  | (478) |
Ending Balance | (1,041) | (1,041) |
Debt Security [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance |  | 4,350 |
Other comprehensive income |  | 1,960 |
Income taxes |  | (432) |
Ending Balance | 5,878 | 5,878 |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance |  | 3,787 |
Ending Balance | $ 4,837 | $ 4,837 |

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