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Stock-based Compensation - Additional Information (Detail)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 01, 2014
May 31, 2016
$ / shares
shares
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense associated with grants | $     $ 400 $ 300 $ 868 $ 660
Restricted Stock Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense associated with grants | $     400 $ 300 900 $ 700
Unamortized stock-based compensation expense related to unvested awards | $     $ 3,100   $ 3,100  
Weighted-average remaining vesting period         2 years 9 months 21 days  
Ensign Employees [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock award conversion ratio related to the spin-off 1          
Ensign Employees [Member] | Restricted Stock Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock awards unvested during spin-off (in shares)         207,580  
Shares vested         28,000  
Unvested stock awards outstanding (in shares)     60,830   60,830  
Member of Board of Directors [Member] | Restricted Stock Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of restricted stock awards granted (in shares)   20,770        
Restricted stock award grand date fair value (in usd per share) | $ / shares   $ 13.13        
Restricted stock vesting period   1 year