Real Estate and Lending Activities - 2016 Activity - Additional Information (Detail) $ in Thousands, € in Millions					3 Months Ended	9 Months Ended
		Jul. 22, 2016 USD ($)	Jun. 22, 2016 EUR (€)	May 02, 2016 USD ($) RenewalOptions	Sep. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)
Business Acquisition [Line Items]
Loans repaid	[1]				$ 93,262	$ 93,262
2016 [Member] | MEDIAN [Member]
Business Acquisition [Line Items]
Value of properties closed | €			€ 41.6
Acquisition costs | €			€ 688.0
Lease agreement, end date			2042-12
Lease rent increase percentage			1.00%
Lease rate			70.00%
2016 [Member] | New Jersey [Member] | Acute Care Hospital [Member]
Business Acquisition [Line Items]
Acquisition costs				$ 63,000
Term of lease				15 years
Number of lease extension options | RenewalOptions				3
Term of lease extension				5 years
Increase in consumer price-index, floor rate				2.00%
Commitment to advance an additional amount for capital additions				$ 30,000
Commitment period to advance an additional amount for capital additions				3 years
Capella [Member]
Business Acquisition [Line Items]
Loans repaid					93,262	93,262
Capella [Member] | 2016 [Member] | Olympia, Washington [Member]
Business Acquisition [Line Items]
Loans repaid		$ 93,300
Cash paid for acquisition transaction		$ 7,000
Business Acquisitions [Member] | 2016 [Member]
Business Acquisition [Line Items]
Revenue contributed by the acquired entity					4,600	5,700
Income contributed by the acquired entity					$ 3,800	4,900
Acquisition related costs						$ 2,400

[1] $93.3 million loans advanced to Capella (now RCCH Healthcare Partners ("RCCH")) in 2015 and repaid in 2016 as a part of the Capella Transaction.