Real Estate and Lending Activities - Assets Acquired (Detail) $ in Thousands	Mar. 31, 2015 USD ($)
Business Acquisition [Line Items]
Total assets acquired	$ 165,700
Land [Member]
Business Acquisition [Line Items]
Total assets acquired	14,844
Building [Member]
Business Acquisition [Line Items]
Total assets acquired	87,914
Intangible Lease Assets - Subject to Amortization [Member]
Business Acquisition [Line Items]
Total assets acquired	7,242
Net Investments in Direct Financing Leases [Member]
Business Acquisition [Line Items]
Total assets acquired	10,700
Other Loans [Member]
Business Acquisition [Line Items]
Total assets acquired	5,000
Mortgage Loans [Member]
Business Acquisition [Line Items]
Total assets acquired	$ 40,000