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Summary of Activity for Company's Restricted Stock (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Weighted Average Grant-Date Fair Value      
Granted $ 7.85 $ 7.76 $ 6.65
Forfeited or expired $ 16.83    
Restricted Stock
     
Number of Shares      
Restricted stock at January 1, 2012 206,313    
Granted 83,807    
Vested (59,365)    
Forfeited or expired (6,750)    
Restricted stock at December 31, 2012 224,005    
Weighted Average Grant-Date Fair Value      
Restricted stock at January 1, 2012 $ 16.37    
Granted $ 19.02    
Vested $ 16.16    
Restricted stock at September 30, 2012 $ 17.40