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Stock Incentive Plans (Narrative) (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 16, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awards issued 275,674 384,847  
Aggregate weighted average grant date fair values $ 3,384 $ 3,887  
Common stock shares available under Incentive Compensation Plans 3,206,008    
Stock options exercised 159,442 8,389  
Intrinsic value of outstanding and exercisable stock options $ (1,751)    
Maximum common shares available for purchase under warrants 1,302,083   651,042
Warrants converted to purchase of common stock 819,640    
Service-Based Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of performance-based payment awards expensed, years 3 years    
Performance-Based Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of performance-based payment awards expensed, years 4 years    
Discretionary Service-Based Awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of performance-based payment awards expensed, years 5 years    
Warrant Expires In 2019 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Warrant, exercise price per share 11.52    
Warrant Expires In 2018 [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Warrant, exercise price per share 5.81    
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense related to restricted stock awards 1,614 1,780  
Tax benefit related to restricted stock awards 565 623  
Total fair value of awards vested 2,044 1,761  
Unrecognized compensation cost related to unvested restricted stock awards 6,999    
Amount subject to accelerated vesting under Incentive Compensation Plan's immediate vesting upon retirement provision for awards granted $ 86    
Employee Stock Option [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of performance-based payment awards expensed, years 10 years