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Employee and Non-Employee Benefit Plans (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2016
USD ($)
plan
shares
Mar. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of active equity-based compensation plans | plan 2  
Directors Option Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (in shares) 36,189  
Minimum [Member] | Non-Employee Director Equity Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 1 year  
Restricted Stock Units (RSUs) [Member] | The 2014 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (in shares) 206,093  
RSUs forfeited for termination of employment (in shares) 6,256  
Unamortized balance of liability-classified awards, net of estimated forfeitures | $ $ 1,193  
Restricted Stock Units (RSUs) [Member] | Employee Equity Incentive Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 3 years  
Restricted Stock and Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested awards (in shares) 665,837  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock (in shares) 128,500 278,900
Vice President [Member] | Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested awards (in shares) 38,514  
Accelerated share-based compensation expense | $ $ 152  
Vice President [Member] | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested awards (in shares) 16,500