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Stock-Based Compensation - Additional Information (Detail)
3 Months Ended 9 Months Ended
Dec. 20, 2013
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
shares
Sep. 30, 2015
USD ($)
Incentive_Plan
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity incentive plans | Incentive_Plan       2
Total unrecognized compensation expense | $   $ 8,154,000   $ 8,154,000
Vesting period       1 year 10 months 24 days
Equity Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant 6,000,000 4,890,558   4,890,558
Annual increase in number of shares of common stock   4.00%   4.00%
Aggregate limit of shares issuable to incentive stock option awards   3,000,000   3,000,000
Increase in percentage of outstanding number of shares of common stock 4.00%      
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Term of years       10 years
Exercise price | $ / shares   $ 20.00   $ 20.00
Percentage of vested grant yearly       25.00%
Percentage of vested grant monthly       75.00%
Number of SARs, outstanding   110,593 110,593 110,593
Number of SARs, Granted   0    
Number of SARs, Exercised   0    
Number of SARs, Forfeited   0    
Vesting period of grant date       3 years
Reduced compensation expense | $   $ 0 $ 0  
Restricted Stock [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Term of years       10 years
Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unexercised vested option forfeiture       3 months
Options [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Term of years       10 years