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Redeemable OP Unitholder and Noncontrolling Interests (Details)
shares in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2018
USD ($)
property
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Redeemable OP Unitholder Interests [Line Items]      
Redeemable OP Unitholder interests | $   $ 174,600,000 $ 146,300,000
NHP/PMB L.P.      
Redeemable OP Unitholder Interests [Line Items]      
Unit conversion factor for common stock   0.9051  
Medical Office Buildings | PMB      
Redeemable OP Unitholder Interests [Line Items]      
Number of real estate properties acquired | property 3    
Real estate properties in which a noncontrolling interest was acquired | property 1    
Other ownership interests, units issued 0.7    
Redeemable OP Unitholder interests | $ $ 34,000,000.0    
Capital Unit, Class A | LImited Partner | NHP/PMB L.P.      
Redeemable OP Unitholder Interests [Line Items]      
Limited partners' units outstanding   3.3  
Percentage of ownership interest on total units outstanding   31.00%  
Capital Unit, Class B | General Partner | NHP/PMB L.P.      
Redeemable OP Unitholder Interests [Line Items]      
Percentage of ownership interest on total units outstanding   69.00%  
General partner's units outstanding   7.3