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Equity Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grants under 2004 Incentive Stock Plan 1,050,084    
Compensation expense, recognition period 2 years 2 months 12 days    
Performance-based awards outstanding 607,500   607,500
Outstanding performance based stock award shares earned 167,667    
Stock-based compensation expense $ 797 $ 711  
Total unrecognized compensation cost $ 6,946    
Stock option expiration period 10 years    
Estimated forfeiture rate used for recording stock-based compensation expense 5.00%    
Performance Shares [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option, vesting period 3 years    
Performance-based awards outstanding 384,196    
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