Real Estate and Lending Activities - Components of Total Investment in Financing Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Direct Financing Lease Net Investment In Leases [Abstract]
Minimum lease payments receivable	$ 1,853,967	$ 1,884,921
Estimated residual values	394,195	394,195
Less: Unearned income and allowance for credit loss	(1,584,334)	(1,618,252)
Net investment in direct financing leases	663,828	660,864
Other financing leases (net of allowance for credit loss)	1,414,381	1,399,438
Total investment in financing leases	$ 2,078,209	$ 2,060,302