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Indebtedness (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
property
building
item
May. 31, 2015
USD ($)
property
community
item
Apr. 30, 2015
USD ($)
item
Feb. 28, 2015
USD ($)
item
Jan. 31, 2015
USD ($)
building
Dec. 31, 2014
USD ($)
community
Jun. 30, 2014
May. 31, 2014
USD ($)
Jun. 30, 2015
USD ($)
property
building
item
Jun. 30, 2014
Sep. 30, 2014
Jun. 30, 2015
USD ($)
property
community
building
item
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Aug. 05, 2015
USD ($)
Indebtedness                              
Number of public issues of unsecured senior notes | item 6               6     6      
Principal amount of unsecured senior notes $ 1,744,339         $ 1,743,628     $ 1,744,339     $ 1,744,339   $ 1,743,628  
Interest rate (as a percent) 1.58%               1.58%     1.58%      
Aggregate principal amount of mortgage debt $ 714,374               $ 714,374     $ 714,374      
Carrying value of mortgaged properties 6,325,535         5,254,761     6,325,535     6,325,535   5,254,761  
Assumption of mortgage notes payable                       169,136 $ 15,630    
Unsecured revolving credit facility 615,000         80,000     615,000     615,000   80,000  
Loss on early extinguishment of debt       $ (1,409)         (39)     (1,448)      
Sale of senior unsecured notes                         $ 350,000    
Net proceeds after underwriting discounts from sale of senior unsecured notes                       644,889      
Unsecured revolving credit facility                              
Indebtedness                              
Unsecured revolving credit facility, maximum borrowing capacity 750,000               750,000     750,000      
Revolving credit facility, available amount 135,000               $ 135,000     135,000     $ 165,000
Extension period of revolving credit facility                 1 year            
Principal repayment due until maturity                 $ 0            
Option to increase the borrowing capacity under revolving credit facility $ 1,500,000               $ 1,500,000     $ 1,500,000      
Interest rate, description                       LIBOR      
Interest rate added to the base rate (as a percent)                 1.30%            
Revolving credit facility, interest rate payable (as a percent) 1.45%               1.45%     1.45%      
Debt instrument, facility fee (as a percent)                 0.30%            
Weighted average interest rate on debt (as a percent)                 1.47% 1.42%   1.48% 1.42%    
Unsecured revolving credit facility $ 615,000               $ 615,000     $ 615,000     $ 585,000
Senior unsecured notes 4.30%                              
Indebtedness                              
Principal amount of unsecured senior notes $ 250,000               $ 250,000     $ 250,000      
Interest rate (as a percent) 4.30%               4.30%     4.30%      
Senior unsecured notes 6.75%                              
Indebtedness                              
Principal amount of unsecured senior notes $ 200,000               $ 200,000     $ 200,000      
Interest rate (as a percent) 6.75%               6.75%     6.75%      
Unsecured senior notes due 2021                              
Indebtedness                              
Principal amount of unsecured senior notes $ 300,000               $ 300,000     $ 300,000      
Interest rate (as a percent) 6.75%               6.75%     6.75%      
Senior unsecured notes 5.625% due in 2042                              
Indebtedness                              
Principal amount of unsecured senior notes $ 350,000               $ 350,000     $ 350,000      
Interest rate (as a percent) 5.625%               5.625%     5.625%      
Mortgages                              
Indebtedness                              
Aggregate principal amount of mortgage debt $ 714,374               $ 714,374     $ 714,374      
Number of properties mortgaged | property 56               56     56      
Number of buildings mortgaged | building 57               57     57      
Carrying value of mortgaged properties $ 1,128,624               $ 1,128,624     $ 1,128,624      
Principal repayment due until maturity 4,351                            
Repayments mortgage note $ 4,867 $ 15,077 $ 6,274 $ 29,227                      
Weighted average interest rate on debt (as a percent) 5.65%               5.65%     5.65%      
Weighted average interest rate on debt (as a percent)       6.02%                      
Weighted average interest rate on prepaid debt (as a percent) 5.81% 5.70% 5.81%                        
Number of mortgage notes | item   4 1 1                      
Number of properties encumbered under mortgage notes | property 1 4             1     1      
Capital leases                              
Indebtedness                              
Carrying value of mortgaged properties $ 35,239               $ 35,239     $ 35,239      
Number of properties recorded under capital lease | property 2               2     2      
Capital leases $ 12,468               $ 12,468     $ 12,468      
Senior unsecured notes due 2019                              
Indebtedness                              
Principal amount of unsecured senior notes $ 400,000               $ 400,000     $ 400,000      
Interest rate (as a percent) 3.25%               3.25%     3.25%      
Senior unsecured notes due 2024                              
Indebtedness                              
Principal amount of unsecured senior notes $ 250,000               $ 250,000     $ 250,000      
Interest rate (as a percent) 4.75%               4.75%     4.75%      
Unsecured Debt                              
Indebtedness                              
Unsecured term loan facility $ 350,000         350,000   $ 350,000 $ 350,000     $ 350,000   $ 350,000  
Interest rate, description               LIBOR     LIBOR        
Interest rate added to the base rate (as a percent)               1.40%           1.40%  
Weighted average interest rate on debt (as a percent)             1.55%   1.60%     1.60%      
Maximum borrowing capacity that may be increased           700,000               $ 700,000  
Senior living communities                              
Indebtedness                              
Number of communities | community                       19      
Senior living communities | Agreement to acquire                              
Indebtedness                              
Assumption of mortgage notes payable   $ 139,181                          
Weighted average interest rate on debt (as a percent)   4.43%                          
Bridge loan commitment received           $ 700,000               $ 700,000  
Number of communities | community   37       38                  
MOBs                              
Indebtedness                              
Number of properties acquired with assumed mortgage debt | building         2                    
MOBs | Mortgages | Significant Unobservable Inputs (Level 3)                              
Indebtedness                              
Assumption of mortgage notes payable         $ 29,955                    
Fair value of mortgage notes payable         $ 31,029                    
Weighted average interest rate on debt (as a percent)                       4.73%