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Employee and Non-Employee Benefit Plans (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2016
USD ($)
plan
shares
Jun. 30, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of active equity-based compensation plans | plan 2  
The Directors' Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 1 year  
Grants in period (in shares) 52,436  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock (in shares) 128,500 248,100
Restricted Stock Units (RSUs) [Member] | The 2014 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 3 years  
Grants in period (in shares) 206,094  
RSUs forfeited for termination of employment (in shares) 11,108  
Unamortized balance of liability-classified awards, net of estimated forfeitures | $ $ 1,111  
Restricted Stock and Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested awards (in shares) 654,486