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Equity Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares available for future grants under 2014 Incentive Stock Plan 1,115,695   1,115,695    
Compensation expense, recognition period 1 year 2 months 12 days        
Performance-based awards outstanding 550,000   550,000   600,000
Outstanding performance based stock award shares earned 31,036   31,036    
Stock-based compensation expense $ 1,198 $ 826 $ 5,057 $ 2,419  
Total unrecognized compensation cost $ 2,893   $ 2,893    
Stock option expiration period 10 years        
Estimated forfeiture rate used for recording stock-based compensation expense 5.00%        
Options granted     0 0  
Shares, aggregate grant date fair value of stock options $ 1,430        
Vesting Range One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of stock options exercise price vested 25.00%        
Vesting Range Two [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of stock options exercise price vested 30.00%        
Vesting Range Three [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of stock options exercise price vested 35.00%        
2004 Incentive Stock Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted 260,000        
Shares, Exercise price $ 25.95        
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock option, vesting period     3 years    
Performance-based awards outstanding 126,625   126,625    
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