Organization and Description of Business (Details) (USD $) In Billions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Class B	Dec. 31, 2012 Class B	Dec. 31, 2013 Medical Office Buildings facility	Dec. 31, 2013 Healthcare Industry Facilities facility
Significant Acquisitions and Disposals
General partnership interest percentage	98.94%
Purchased property inception to current date	$ 3.0
Number of real estate properties				269	19
Common stock, shares outstanding		0	114,566,254