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Stock-Based Compensation - Additional Information (Detail)
3 Months Ended 6 Months Ended
Dec. 20, 2013
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2014
USD ($)
shares
Jun. 30, 2015
USD ($)
Incentive_Plan
$ / shares
shares
Dec. 31, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity incentive plans | Incentive_Plan       2  
Shares authorized   225,000,000   225,000,000 225,000,000
Total unrecognized compensation expense | $   $ 9,636,000   $ 9,636,000  
Vesting period       2 years 1 month 6 days  
Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized   5,295,655   5,295,655  
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  
Initial grant of stock-based compensation in shares 6,000,000        
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