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Summary of Potential Number of Shares Vesting under Restricted Stock Unit Awards (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2013
at IRR of at least 8.5% |
Schedule Of Stock Options [Line Items] |
Number of shares vesting at IRR level of at least 8.5% | 38,366
Fair value of shares vesting at IRR level of at least 8.5% | $ 1,129
at IRR of at least 10.5% |
Schedule Of Stock Options [Line Items] |
Number of shares vesting at IRR level of at least 10.5% | 76,741
Fair value of shares vesting at IRR level of at least 10.5% | 2,259
at IRR of at least 12.5% |
Schedule Of Stock Options [Line Items] |
Number of shares vesting at IRR level of at least 12.5% | 115,107
Fair value of shares vesting at IRR level of at least 12.5% | $ 3,389

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- Details
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