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Employee Benefit Plans - Additional Information (Detail) (USD $)
9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2013
Restricted Stock
Sep. 30, 2013
Restricted Stock
Defined Benefit Plan Disclosure [Line Items]        
Deferred compensation liabilities   $ 1,200,000    
Cash surrender value of life insurance policies   1,200,000    
Stock based awards 700,000      
Stock based awards, term 10 years      
Stock based awards, restricted share granted       168,642
Stock based awards, fair value of shares granted       $ 11.50
Share based compensation cost 1,012,000   200,000 1,000,000
Stock based awards, unvested restricted shares     112,223 112,223
Stock based awards, unvested restricted shares total compensation cost     $ 900,000 $ 900,000
Stock based awards, unvested restricted shares total compensation cost period     21 months