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Stock Purchase - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Sep. 30, 2013
Aug. 10, 2011
Stock Purchase [Abstract]          
Repurchased shares of common stock 180,000   62,519    
Repurchased Common stock value $ 2,400 $ 0 $ 456    
Current market price of purchased Shares $ 13.14        
Authorized share buy back program, number of shares         500,000
Share repurchase period       18 months