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Other - Additional Information (Detail) (USD $)
1 Months Ended 3 Months Ended 1 Months Ended
May 06, 2012
Jan. 11, 2012
Mar. 31, 2013
Mar. 31, 2012
Apr. 30, 2013
Subsequent Event
Dividend Declared [Line Items]          
Dividend declared date Mar. 06, 2012 Jan. 11, 2012 Mar. 12, 2013    
Cash dividend declared per common share $ 0.025 $ 0.025 $ 0.03125 $ 0.05000  
Dividend Payable date May 15, 2012 Feb. 15, 2012 May 15, 2013    
Dividend record date May 01, 2012 Feb. 01, 2012 May 01, 2013    
Accrual of dividend payable     $ 401,000    
Stock repurchase program authorized     $ 10,000,000    
Option grants     100,000   290,800