Summary of Significant Accounting Policies - Summary of Financing Receivables (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Summary of financing receivables
Direct financing leases	$ 575,163	$ 495,990
Other loan receivables
Total direct financing leases and other loan receivables	822,261	762,071
Payment activity \| Performing
Summary of financing receivables
Direct financing leases	575,163	495,990
Other loan receivables
Long-term receivable and accrued revenue included in accounts receivable and other assets	15,694	12,175
Other internal metrics \| Performing
Other loan receivables
Loans to equity-accounted investees and joint venture partners	$ 231,404	$ 253,906

Amount due from customers or clients, more than one year from the balance sheet date, for goods or services that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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-Subparagraph (SX 210.7-03(5))
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The net investment in direct financing leases as of the balance sheet date consisting of: (a) minimum lease payments due on direct financing leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

+ References

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For an unclassified balance sheet, amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

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-Publisher FASB
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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

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