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Summary of Nonvested Shares (Detail) (Restricted Stock Units (RSUs), USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Year
Dec. 31, 2010
Dec. 31, 2009
Restricted Stock Units (RSUs)
     
Shares Underlying RSUs      
Nonvested beginning balance 905,000 876,000 872,000
Granted 799,000 427,000 326,000
Vested and released (416,735) (327,000) (257,000)
Forfeited (80,000) (71,000) (65,000)
Nonvested ending balance 1,208,000 905,000 876,000
Average Grant Date Fair Value Price per Share      
Nonvested beginning balance $ 14.19 $ 11.95 $ 13.68
Granted $ 21.24 $ 17.59 $ 8.56
Vested and released $ 13.94 $ 12.72 $ 13.39
Forfeited $ 17.53 $ 13.80 $ 12.44
Nonvested ending balance $ 18.71 $ 14.19 $ 11.95
Weighted Remaining Vesting Period (in years)      
Nonvested as of December 31, 2011 1.35    
Aggregate Intrinsic Value      
Nonvested as of December 31, 2011 $ 28,543