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Stock-based Compensation - Additional Information (Detail)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 01, 2014
Sep. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2015
$ / shares
shares
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
Dec. 31, 2014
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense associated with grants | $       $ 435 $ 1,095 $ 0  
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            
Restricted Stock Awards [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares vested         32,643    
Shares forfeited         0    
Compensation expense associated with grants | $       400 $ 1,100    
Unamortized stock-based compensation expense related to unvested awards | $   $ 4,200   $ 4,200 $ 4,200    
Weighted-average remaining vesting period         3 years 6 months    
Restricted Stock Awards [Member] | Ensign Employees [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock awards unvested during spin-off (in shares)         207,580    
Shares vested         56,410    
Unvested stock awards outstanding (in shares)   102,620   102,620 102,620    
Restricted Stock Awards [Member] | Board Of Directors [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted             12,270
Shares granted, fair market value (in usd per share) | $ / shares             $ 12.23
Shares granted, vesting period     1 year       3 years
Shares granted, vesting period, start date         May 31, 2015    
Restricted Stock Awards [Member] | Officers and Employees [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares vested       0      
Shares granted     235,880       142,770
Shares granted, fair market value (in usd per share) | $ / shares     $ 12.76       $ 12.23
Shares granted, vesting period     4 years       5 years
Shares granted, vesting period, start date         May 31, 2015    
Restricted Stock Awards [Member] | Employee [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted   7,500          
Shares granted, fair market value (in usd per share) | $ / shares   $ 10.87          
Shares granted, vesting period   4 years          
June 2015 Award 1 [Member] | Restricted Stock Awards [Member] | Board Of Directors [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted     15,680        
Shares granted, fair market value (in usd per share) | $ / shares     $ 12.76        
June 2015 Award 2 [Member] | Restricted Stock Awards [Member] | Board Of Directors [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares granted     13,240        
Shares granted, fair market value (in usd per share) | $ / shares     $ 12.67