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Stock-based Compensation - Additional Information (Detail)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 01, 2014
Jun. 30, 2015
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
Dec. 31, 2014
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation expense associated with grants | $     $ 294 $ 660 $ 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 | $     300 $ 700    
Unamortized stock-based compensation expense related to unvested awards | $   $ 4,500 $ 4,500 $ 4,500    
Weighted-average remaining vesting period       3 years 8 months 12 days    
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       41,600    
Unvested stock awards outstanding (in shares)   117,430 117,430 117,430    
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 | $ / 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 | $ / shares   $ 12.76       $ 12.23
Shares granted, vesting period   4 years       5 years
Shares granted, vesting period, start date       May 31, 2015    
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 | $ / 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 | $ / shares   $ 12.67