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Financial Instruments - Financing Receivables (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Other loan receivables    
Total direct financing leases and other loan receivables $ 956,304 $ 982,336
Performing | Payment activity    
Class of Financing Receivable    
Direct financing leases 633,805 660,594
Other loan receivables    
Long-term receivable included in other assets 11,577 17,712
Performing | Other internal metrics    
Other loan receivables    
Loans to equity-accounted investees and joint venture partners $ 310,922 $ 304,030