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Summary of Potential Number of Shares Vesting under Restricted Stock (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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% | 50,981 | 51,239 | 132,144
Fair value of shares vesting at IRR level of at least 8.5% | $ 1,103 | $ 991 | $ 2,423
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% | 101,974 | 102,488 | 264,288
Fair value of shares vesting at IRR level of at least 10.5% | 2,206 | 1,983 | 4,847
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% | 152,955 | 153,727 | 396,429
Fair value of shares vesting at IRR level of at least 12.5% | $ 3,308 | $ 2,975 | $ 7,271

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