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Summary of Potential Number of Shares Vesting under Restricted Stock Unit Awards (Detail) $ in Thousands | 6 Months Ended
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Jun. 30, 2016 USD ($) shares
Schedule of Restricted Stock Unit [Line Items] |
Number of shares vesting at IRR of at least 6.0% | shares | 84,554
Number of shares vesting at IRR of at least 8.0% | shares | 169,107
Number of shares vesting at IRR of at least 10.0% | shares | 253,661
Value at grant at IRR of at least 6.0% | $ | $ 2,522
Value at grant at IRR of at least 8.0% | $ | 5,044
Value at grant at IRR of at least 10.0% | $ | $ 7,568

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