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Summary of Unvested Restricted Shares (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Unvested restricted stock awards Outstanding 320
Restricted shares granted 188
Restricted shares Vested (47)
Restricted Stock Forfeited (171)
Unvested restricted Shares Expected to Vest 279
Unvested restricted stock awards Outstanding 290
Weighted-Average Exercise Price, Outstanding $ 6.25
Weighted-Average Exercise Price, Granted $ 12.56
Weighted-Average Exercise Price, Exercised $ 5.33
Weighted-Average Exercise Price, Forfeited/Cancelled $ 7.57
Weighted-Average Exercise Price, Outstanding $ 9.71
Weighted-Average Grant-Date Fair Value, Expected To Vest $ 10.13