Real Estate and Loans Receivable - 2012 Activity - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 14, 2012	Jul. 03, 2012 Property	Sep. 19, 2012	Feb. 29, 2012
Significant Acquisitions and Disposals [Line Items]
New mortgage loan funded	$ (3,650,000)
Ownership interest in equity	100.00%
Income contributed by the acquired entity	67,150,000	144,545,000
Acquisition related costs	26,389,000	19,494,000	5,420,000
2012 [Member]
Significant Acquisitions and Disposals [Line Items]
Aggregate purchase price	200,000,000
Term of lease, years	20 years
Number of lease extension options in current lease contract	3
Term of lease extension, years	5 years
Percentage of rental rate	9.00%
Loan secured by mortgage interest	100,000,000
2012 [Member] | Maximum [Member] | Ceiling [Member]
Significant Acquisitions and Disposals [Line Items]
Percentage of rental rate	5.00%
2012 [Member] | Minimum [Member] | Floor Rate [Member]
Significant Acquisitions and Disposals [Line Items]
Percentage of rental rate	2.00%
2012 [Member] | Rehabilitation Hospital [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired	5
2012 [Member] | Business Acquisitions [Member]
Significant Acquisitions and Disposals [Line Items]
Revenue contributed by the acquired entity			46,300,000
Income contributed by the acquired entity			46,100,000
Acquisition related costs			5,400,000
Acquisition-related costs on consummated deals			5,100,000
2012 [Member] | Ernest Health, Inc [Member]
Significant Acquisitions and Disposals [Line Items]
Combined purchase price and investment amount							396,500,000
Total investment	96,500,000
Acquisition loan made	93,200,000
Preferential rate of return on loan amount	15.00%
Coupon payable in cash in, thereafter	10.00%
Agreement terms	Although there are provisions in the loan agreement that are expected to result in full payment of the 15% preference when funds are sufficient. Any of the 15% in excess of the minimum that is not paid may be accrued, interest compounded, and paid upon the occurrence of a capital or liquidity event and is payable at maturity. The loan may be prepaid without penalty at any time.
2012 [Member] | Ernest Health, Inc [Member] | Key Management Personnel [Member]
Significant Acquisitions and Disposals [Line Items]
Capital contribution	3,300,000
2012 [Member] | Ernest Health, Inc [Member] | Minimum [Member]
Significant Acquisitions and Disposals [Line Items]
Coupon payable in cash, year one	6.00%
Coupon payable in cash, year two	7.00%
2012 [Member] | Acute Care Facility [Member]
Significant Acquisitions and Disposals [Line Items]
Number of facilities acquired	7
Number of states	7
Term of lease, years	15 years
Number of lease extension options in current lease contract				3
Term of lease extension, years	5 years
Number of beds acquired				40
Business acquisition cost of acquired entity				10,500,000
Payments to acquire equity method investments				2,000,000
Ownership interest in equity				25.00%
Working capital loan to the joint venture				2,500,000
Date of properties acquired	Dec. 14, 2012
2012 [Member] | Acute Care Facility [Member] | Maximum [Member]
Significant Acquisitions and Disposals [Line Items]
Revolving loan				2,000,000
2012 [Member] | Prime Health Care Services [Member]
Significant Acquisitions and Disposals [Line Items]
Number of beds at Centinela Hospital Medical Center used to secure loan					369
Maturity of mortgage loan	Dec. 31, 2022
2012 [Member] | Prime Health Care Services [Member] | Loans, net [Member]
Significant Acquisitions and Disposals [Line Items]
New mortgage loan funded					100,000,000
2012 [Member] | St. Mary's Regional Medical Center [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Significant Acquisitions and Disposals [Line Items]
Number of beds acquired						380
Business acquisition cost of acquired entity						80,000,000
2012 [Member] | Roxborough Memorial Hospital [Member] | Series of Individually Immaterial Business Acquisitions [Member]
Significant Acquisitions and Disposals [Line Items]
Number of beds acquired						140
Business acquisition cost of acquired entity						$ 30,000,000