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Summary of Potential Number of Shares Vesting under Restricted Stock Unit Awards (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($) shares
Disclosure Of Restricted Stock Unit [Abstract] |
Number of shares vesting at IRR of at least 6% | shares | 136,285
Number of shares vesting at IRR of at least 8% | shares | 204,427
Number of shares vesting at IRR of at least 14% | shares | 306,651
Value at grant at IRR of at least 6% | $ | $ 5,011
Value at grant at IRR of at least 8% | $ | 7,517
Value at grant at IRR of at least 14% | $ | $ 11,276

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