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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 | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule of Restricted Stock Unit [Line Items] |  |  |
Number of shares vesting at IRR level of at least 8.5% | 38,366 | 50,981 | 51,239
Number of shares vesting at IRR level of at least 10.5% | 76,741 | 101,974 | 102,488
Number of shares vesting at IRR level of at least 12.5% | 115,107 | 152,955 | 153,727
Fair value of shares vesting at IRR level of at least 8.5% | $ 1,129 | $ 1,103 | $ 991
Fair value of shares vesting at IRR level of at least 10.5% | 2,259 | 2,206 | 1,983
Fair value of shares vesting at IRR level of at least 12.5% | $ 3,389 | $ 3,308 | $ 2,975

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- Definition Number of shares vesting at an IRR level of at least 10.5%. + References No definition available. + Details
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- Definition Number of shares vesting at an IRR level of at least 12.5%. + References No definition available. + Details
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- Details
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- Definition Grant date fair value of units that would vest at an IRR level of at least 8.5%. + References No definition available. + Details
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- Definition Grant date fair value of units that would vest at an IRR level of at least 10.5%. + References No definition available. + Details
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