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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, 2015 USD ($) shares
Schedule of Restricted Stock Unit [Line Items] |
at IRR of at least 7.5% | shares | 47,640
at IRR of at least 9.5% | shares | 95,282
at IRR of at least 11.5% | shares | 142,922
at IRR of at least 7.5% | $ 2,057
at IRR of at least 9.5% | 4,115
at IRR of at least 11.5% | $ 6,173

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