Real Estate and Lending Activities - Components of Total Investment in Financing Leases (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Direct Financing Lease Net Investment In Leases [Abstract]
Minimum lease payments receivable	$ 1,869,444	$ 1,884,921
Estimated residual values	394,195	394,195
Net investment in direct financing leases	661,981	660,864
Less: Unearned income and allowance for credit loss	(1,601,658)	(1,618,252)
Other financing leases (net of allowance for credit loss)	1,406,185	1,399,438
Total investment in financing leases	$ 2,068,166	$ 2,060,302