Real Estate and Loans Receivable - Disposals - Additional Information (Detail) (USD $)	12 Months Ended			3 Months Ended	0 Months Ended			3 Months Ended	0 Months Ended		12 Months Ended	0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012 Disposals [Member]	Dec. 27, 2012 Disposals [Member] Huntington [Member]	Sep. 28, 2012 Disposals [Member] Thornton [Member]	Oct. 22, 2012 Disposals [Member] New Bedford [Member]	Dec. 31, 2012 Disposals [Member] New Bedford [Member]	Aug. 21, 2012 Disposals [Member] Denham Springs LTACH [Member]	Jun. 15, 2012 Disposals [Member] HealthSouth Rehabilitation Hospital of Fayetteville [Member]	Dec. 31, 2011 Disposals [Member] Mountain View Regional Rehabilitation Hospital [Member]	Dec. 30, 2011 Disposals [Member] Sherman Oaks Hospital [Member]	Nov. 27, 2013 Disposals [Member] San Antonio, TX [Member]	Apr. 17, 2013 Disposals [Member] Summit Hospital of Southeast Arizona and Summit Hospital of Southeast Texas [Member]
Significant Acquisitions and Disposals [Line Items]
Proceeds from sale of real estate	$ 32,409,000	$ 71,202,000	$ 41,130,000	$ 42,000,000	$ 12,500,000				$ 5,200,000	$ 16,000,000	$ 21,100,000	$ 20,000,000	$ 14,000,000	$ 18,500,000
Gain (loss) on sale of real estate					1,900,000	8,400,000	7,200,000		300,000	(1,400,000)	2,300,000	3,100,000	5,600,000	2,100,000
Straight-line rent write-off					$ 700,000	$ 1,600,000		$ 4,100,000				$ 1,200,000