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Summary of Status of Outstanding RSU Awards (Detail) (Restricted stock units (RSUs), USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Restricted stock units (RSUs)
     
Number of Share      
Beginning Balance 437,272 849,512 564,938
Granted 23,138 32,428 428,722
Vested (286,486) (425,556) (36,694)
Forfeited (4,580) (19,112) (107,454)
Ending Balance 169,344 437,272 849,512
Weighted Average Grant Date Fair Value      
Beginning Balance $ 6.96 $ 7.04 $ 8.63
Granted $ 38.42 $ 24.23 $ 4.95
Vested $ 6.88 $ 8.42 $ 7.52
Forfeited $ 8.64 $ 7.14 $ 6.93
Ending Balance $ 11.33 $ 6.96 $ 7.04
Aggregate Intrinsic Value      
Aggregate intrinsic value (in thousands) $ 6,030 $ 17,119 $ 23,349