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Stock-Based Compensation - Additional Information (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
Plan
shares
Jun. 30, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of stock based compensation plans | Plan 1  
Unrecognized compensation cost related to unvested awards | $ $ 4.1  
2014 Stock Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total aggregate number of shares of common stock that may be issued 6,420,000  
Performance-Based Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 3 years  
Performance-Based Restricted Stock [Member] | Share-Based Compensation Award, Tranche One [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based Compensation vesting percentage 33.33%  
Performance-Based Restricted Stock [Member] | Share-Based Compensation Award, Tranche Two [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based Compensation vesting percentage 33.33%  
Performance-Based Restricted Stock [Member] | Share-Based Compensation Award, Tranche Three [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based Compensation vesting percentage 33.33%  
Stock Appreciation Rights [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Fair value assumptions method used Black-Scholes option-pricing formula  
Number of shares or rights issued 16,340 0
Minimum [Member] | Performance-Based Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of target number of shares that will vest 0.00%  
Maximum [Member] | Performance-Based Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of target number of shares that will vest 200.00%