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Share-Based Compensation - Summary of the Status of Restricted Shares (Detail) (Restricted stock [Member], USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Restricted stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Nonvested Shares, beginning balance (in shares) 124,352  
Nonvested Shares, Granted (in shares) 62,105 40,000
Nonvested Shares, Vested (in shares) (43,426)  
Nonvested Shares, Forfeited or expired (in shares) 0 2,500
Nonvested Shares, ending balance (in shares) 143,031 124,352
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Weighted Average Exercise Price per Share, Beginning balance $ 4.68  
Weighted Average Exercise Price per Share, Granted $ 5.39 $ 5.28
Weighted Average Exercise Price per Share, Vested $ 4.42  
Weighted Average Exercise Price per Share, Forfeited or expired $ 0.00  
Weighted Average Exercise Price per Share, Ending balance $ 5.07 $ 4.68