XML 66 R52.htm IDEA: XBRL DOCUMENT v3.3.1.900
Stock-based Compensation - Additional Information (Detail)
$ in Thousands
12 Months Ended
Jun. 01, 2014
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense associated with grants | $   $ 1,522 $ 154 $ 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]        
Compensation expense associated with grants | $   1,500 $ 200  
Unamortized stock-based compensation expense related to unvested awards | $   $ 3,700    
Weighted-average remaining vesting period   3 years 2 months    
Shares vested   32,643    
Unvested stock awards outstanding (in shares)   394,697 155,040  
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   70,200    
Unvested stock awards outstanding (in shares)   88,830