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Share-based Compensation - Summary of RSU Activity (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested stock Options, Balance, beginning of year 412,943 447,693 518,275
Options Outstanding, Granted     62,475
Options Outstanding, Forfeited or expired (16,038) (20,750) (116,649)
Non-vested stock Options, Balance, end of year 367,906 412,943 447,693
Restricted Stock Units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested stock Options, Balance, beginning of year 125,888    
Options Outstanding, Granted 164,519 127,192  
Options Outstanding, Vested Shares issued (18,821)    
Options Outstanding, Vested shares forfeited for taxes (11,517)    
Options Outstanding, Forfeited or expired (8,740) (1,304)  
Non-vested stock Options, Balance, end of year 251,329 125,888  
Weighted Average Grant Date Fair Value, Balance, beginning of year 9.40    
Weighted Average Grant Date Fair Value, Granted 8.76 9.40  
Weighted Average Grant Date Fair Value, Vested Shares issued 9.40    
Weighted Average Grant Date Fair Value, Vested Shares forfeited for taxes 9.40    
Weighted Average Grant Date Fair Value, Forfeited or expired 9.20 9.40  
Weighted Average Grant Date Fair Value, Balance, end of year 8.99 9.40