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Percentage of voting equity interests acquired in the business combination.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

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INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Two Medical Office Buildings Acquired March 2013 property	Feb. 28, 2013 Two Medical Office Buildings Acquired March 2013	Mar. 31, 2013 Unconsolidated Properties property	Dec. 31, 2012 Unconsolidated Properties property	Mar. 31, 2013 Unconsolidated Properties Minimum	Dec. 31, 2012 Unconsolidated Properties Minimum	Mar. 31, 2013 Unconsolidated Properties Maximum	Dec. 31, 2012 Unconsolidated Properties Maximum	Mar. 31, 2013 ATRIA	Dec. 31, 2012 ATRIA
Equity Method Investments and Joint Ventures [Abstract]
Management fees earned in connection with unconsolidated entities	$ 1.5	$ 1.8
Equity method investments
Ownership interests accounted for under the equity method (as a percent)							5.00%	5.00%	25.00%	25.00%	34.00%	34.00%
Number of properties accounted for under equity method					53	55
Ownership interests in properties accounted for under the equity method (as a percent)			95.00%
Number of real estate properties			2
Purchase of joint venture interests			55.2
Investment in joint ventures				0.2
Fair value of previously held equity interest			1.5
Gain on re-measurement of equity method investments			$ 1.3