Real Estate and Lending Activities - 2014 Activity - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended
	Mar. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Significant Acquisitions and Disposals [Line Items]
Income contributed by the acquired entity		$ 50,200	$ 20,600	$ 99,800	$ 44,600
Acquisition related costs		25,809,000	2,535,000	32,048,000	3,047,000
2015 [Member] | Business Acquisitions [Member]
Significant Acquisitions and Disposals [Line Items]
Revenue contributed by the acquired entity		4,200,000		6,200,000
Income contributed by the acquired entity		3,500,000		4,900,000
Acquisition related costs		$ 22,600,000		$ 26,700,000
2014 [Member] | Acute Care Hospital [Member]
Significant Acquisitions and Disposals [Line Items]
Acquisition costs	$ 115,000,000
Term of lease, years	15 years
Term of lease extension, years	3 years
2014 [Member] | Acute Care Hospital [Member] | Fair value market [Member]
Significant Acquisitions and Disposals [Line Items]
Term of lease extension, years	12 years
2014 [Member] | Business Acquisitions [Member]
Significant Acquisitions and Disposals [Line Items]
Revenue contributed by the acquired entity			2,300,000		2,300,000
Income contributed by the acquired entity			1,600,000		1,600,000
Acquisition related costs			$ 400,000		$ 400,000