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Summary of Potential Number of Shares Vesting under Restricted Stock Unit Awards (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 USD ($) shares
Disclosure Of Restricted Stock Unit [Abstract] |
Number of shares vesting at IRR of at least 7% | shares | 76,065
Number of shares vesting at IRR of at least 9.5% | shares | 152,129
Number of shares vesting at IRR of at least 13% | shares | 228,194
Value at grant at IRR of at least 7% | $ | $ 2,967
Value at grant at IRR of at least 9.5% | $ | 5,938
Value at grant at IRR of at least 13% | $ | $ 8,906

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