Summary Of Restricted Stock And Restricted Stock Units Granted (Parenthetical) (Detail) (USD $)	12 Months Ended
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, Shares forfeited	2,013
Restricted stock units, Forfeited shares price per share	$ 29.84

Stock Issued During Period Price Per Shares Restricted Stock Units Award Forfeited

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