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Stock-Based Compensation - Additional Information (Detail)
12 Months Ended
Dec. 20, 2013
shares
Dec. 31, 2015
USD ($)
Incentive_Plan
$ / shares
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity incentive plans | Incentive_Plan   2    
Term of years   5 years 8 months 12 days 4 years 2 months 12 days 5 years 1 month 6 days
Total unrecognized compensation expense | $   $ 5,924,000    
Vesting period   1 year 8 months 12 days    
Options granted   2,595,000 0 0
Intrinsic value of options at time of exercise | $       $ 2,214
Options exercised   0 0 (3,452)
Exercise price | $ / shares   $ 12.14    
Equity Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for grant 6,000,000 6,207,871    
Annual increase in number of shares of common stock   4.00%    
Aggregate limit of shares issuable to incentive stock option awards   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    
Percentage of vested grant yearly   25.00%    
Percentage of vested grant monthly   75.00%    
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 $ 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    
Estimated fair value | $   $ 59,000 $ 138,000 $ 406,000
Options [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Term of years   10 years