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Stock-Based Compensation - Summary of Compensation Expense Recognized Related to all Stock-Based Awards (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Total stock-based compensation | $ 14,814 | $ 15,906 | $ 12,612

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