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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, 2017 USD ($) shares
Disclosure Of Restricted Stock Unit [Abstract] |
Number of shares vesting at IRR of at least 7% | shares | 58,545
Number of shares vesting at IRR of at least 9.5% | shares | 117,089
Number of shares vesting at IRR of at least 13% | shares | 175,634
Value at grant at IRR of at least 7% | $ | $ 2,481
Value at grant at IRR of at least 9.5% | $ | 4,961
Value at grant at IRR of at least 13% | $ | $ 7,442

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