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Shares Repurchased - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Equity [Abstract]      
Repurchased common stock, shares 136,641 357,123  
Repurchased shares, value $ 1,613 $ 2,261 $ 2,153