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Summary of Activity for Company's Restricted Stock (Detail) (USD $)
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Weighted Average Grant-Date Fair Value    
Granted $ 7.85 $ 7.76
Restricted Stock
   
Number of Shares    
Restricted stock - beginning 206,313  
Granted 83,807  
Vested (59,165)  
Forfeited or expired (5,494)  
Restricted stock - ending 225,461  
Weighted Average Grant-Date Fair Value    
Restricted stock - beginning $ 16.37  
Granted $ 19.02  
Vested $ 16.15  
Forfeited or expired $ 16.78  
Restricted stock - ending $ 17.40