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Equity Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for future grants under 2004 Incentive Stock Plan 1,102,010   1,102,010    
Compensation expense, recognition period     1 year 10 months 24 days    
Performance-based awards outstanding 657,500   657,500   747,500
Outstanding performance based stock award shares earned 135,803   135,803    
Stock-based compensation expense $ 608 $ 521 $ 1,926 $ 1,622  
Total unrecognized compensation cost 4,768   4,768    
Stock option expiration period     10 years    
Estimated forfeiture rate used for recording stock-based compensation expense     5.00%    
Options granted            
Vice President [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense       $ 115  
Performance Shares [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock option, vesting period     3 years    
Performance-based awards outstanding 361,603   361,603    
Employee Stock Option [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock option, vesting period     3 years    
Minimum [Member] | Restricted Stock [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock option, vesting period     1 year    
Compensation expense, recognition period     1 year    
Maximum [Member] | Restricted Stock [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock option, vesting period     3 years    
Compensation expense, recognition period     3 years