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Share-Based Compensation - Summary of the Status of Restricted Shares (Detail) (USD $)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2011
Mar. 31, 2012
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested Shares, Granted     35,000
Nonvested shares, Forfeited or expired     2,500
Weighted Average Exercise Price per Share, Granted     $ 5.39
Restricted stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested Shares, Beginning balance   124,352 124,352
Nonvested Shares, Granted 40,000 62,105 62,105
Nonvested shares, Forfeited or expired       
Nonvested Shares, vested     (33,749)
Nonvested Shares, ending balance     152,708
Weighted Average Exercise Price per Share, Beginning balance   $ 4.68 $ 4.68
Weighted Average Exercise Price per Share, Granted $ 5.28 $ 5.39 $ 5.39
Weighted Average Exercise Price per Share, forfeited or expired       
Weighted Average Exercise Price per Share, vested     $ 4.35
Weighted Average Exercise Price per Share, Ending balance     $ 5.04