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Stock Repurchase Program - Additional Information (Detail) (USD $)
6 Months Ended 1 Months Ended
Aug. 02, 2014
Sep. 11, 2014
Subsequent Event [Member]
May 22, 2014
Maximum [Member]
Stock Repurchase Program [Line Items]      
Stock repurchase program, Authorized amount $ 28,800,000   $ 30,000,000
Stock repurchase program, Expiration date May 31, 2016    
Stock repurchased and retired during period, Shares 68,000 43,000  
Stock repurchased and retired during period, Value $ 1,235,000 $ 780,000