Real Estate and Loans Receivable - Loans - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Mar. 01, 2012	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Existing mortgage loans		$ 757,500	$ 397,500	$ 388,650	$ 368,650
Amount of convertible note converted into equity interest	$ 1,700
Convertible note	$ 5,000
Percentage of equity shares from convertible debt	9.90%	15.10%
Remaining convertible debt after conversion of part of debt		$ 3,300
Ernest Transaction and Other Acquisitions [Member]
Business Acquisition [Line Items]
Existing mortgage loans		114,400
Capella [Member]
Business Acquisition [Line Items]
Increase in mortgage loans		210,000
Existing mortgage loans		$ 487,700