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Stock Incentive Plans (Narrative) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Jun. 16, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards issued 295,705 275,674  
Aggregate, weighted average grant date fair value $ 3,472 $ 3,384  
Common stock shares available under Incentive Compensation Plans 2,794,326    
Stock options exercised   36,385  
Stock options granted        
Intrinsic value of outstanding and exercisable stock options $ (32)    
Maximum common shares available for purchase under warrants 1,302,083   651,042
Warrant issued 819,640    
Service-Based Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of awards expensed, years 3 years    
Performance-Based Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of awards expensed, years 4 years    
Discretionary Service-Based Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of awards expensed, years 5 years    
Warrant Expires In 2019 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Warrant issued, exercise price 11.52    
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense related to restricted stock awards 1,083 575  
Tax benefit related to restricted stock awards 379 201  
Total fair value of awards vested 8,259 2,034  
Unrecognized compensation cost related to unvested restricted stock awards 7,485    
Amount subject to accelerated vesting under Incentive Compensation Plan $ 158    
Employee Stock Option [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of awards expensed, years 10 years    
Stock options exercised 0 36,385  
Warrant Expires in 2018 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Warrant issued, exercise price 5.81