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Repurchase of Common Stock (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Equity, Class of Treasury Stock [Line Items]    
Shares repurchased 726 59
Aggregate repurchase price $ 21,168 $ 1,366
Average price paid per share $ 29.18 $ 23.10