Brookdale Lease Amendments and Terminations and the Formation of Two RIDEA Joint Ventures (Details 3) (USD $)	9 Months Ended		1 Months Ended		0 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 RIDEA JV	Sep. 30, 2014 Brookdale Senior Living	Aug. 29, 2014 Brookdale Senior Living RIDEA JV property	Sep. 30, 2014 Brookdale Senior Living RIDEA JV	Aug. 29, 2014 Brookdale Senior Living RIDEA JV property
Lease Amendments And Terminations And Joint Venture Formations [Line Items]
Number of facilities for which existing lease agreement is terminated					49
Number of properties with purchase options that will be cancelled on termination							19
Ownership percentage (as a percent)	49.00%			20.00%
Investment in strategic joint venture						$ 47,000,000
Initial direct costs and lease inducements	144,465,000	104,601,000
Straight-line rent receivable for former scheduled rent increases	347,109,000	368,919,000
Net Gain Recognized on Lease Terminations
Gain (Loss) on Contract Termination	38,001,000		38,000,000
Gain based on fair value of net consideration received for lease terminations			108,000,000
Charges related to lease termination write-offs			70,000,000
Lease Terminations Considerations Received Abstract
Investment in strategic joint venture						47,000,000
Consideration received - Short-term receivable						34,000,000
Consideration received - Note receivable							68,000,000
Effective offset for net consideration paid						$ 53,000,000