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Stock-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 01, 2014
shares
Feb. 28, 2021
installment
company
$ / shares
shares
Jan. 31, 2021
installment
$ / shares
shares
Mar. 31, 2021
USD ($)
shares
Dec. 31, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unamortized stock-based compensation expense related to unvested awards | $       $ 14.5  
Weighted average remaining vesting period related to expense recognition       2 years 6 months  
Restricted stock award | Ensign Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock awards unvested during spin-off (in shares) 207,580        
Shares forfeited (shares)         1,760
Unvested stock awards outstanding (in shares)       0  
Restricted stock award | Officers and employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of awards granted (in shares)   99,189 140,514    
Award grant date fair value (in usd per share) | $ / shares   $ 22.18 $ 22.48    
Number of equal annual vesting installments | installment   3 3    
Performance stock award          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Historical volatility term basis for expected volatility assumption       2 years 10 months 2 days  
Performance stock award | Officers          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of awards granted (in shares)   99,189 108,414    
Award grant date fair value (in usd per share) | $ / shares   $ 27.98 $ 22.48    
Vesting period (in years)   3 years      
Number of publicly traded healthcare REITs in peer group | company   16      
Performance stock award | Minimum | Officers          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years)     1 year    
Percentage of awards to vest relative To initial grant based on TSR performance   0.00%      
Performance stock award | Maximum | Officers          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period (in years)     3 years    
Percentage of awards to vest relative To initial grant based on TSR performance   200.00%