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Summary of MSU Performance (Detail) (Market Performance Based Restricted Stock Units, USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Year
Market Performance Based Restricted Stock Units
 
Number of Shares  
Granted 138,000
Vested and released (2,556)
Forfeited (7,000)
Nonvested ending balance 128,000
Weighted Average Remaining Contractual Term  
Nonvested as of December 31, 2011 1.63
Aggregate Intrinsic Value  
Nonvested as of December 31, 2011 $ 3,042