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Real Estate and Loans Receivable - Components of Net Investment in Direct Financing Leases (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Business Combinations [Abstract]    
Minimum lease payments receivable $ 2,207,625 $ 2,587,912
Estimated residual values 407,647 393,097
Less unearned income (1,967,170) (2,354,013)
Net investment in direct financing leases $ 648,102 $ 626,996