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Financing Receivables (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Class of Financing Receivable    
Direct financing leases $ 490,747 $ 495,990
Other loan receivables    
Total direct financing leases and other loan receivables 737,329 762,071
Performing | Payment activity    
Class of Financing Receivable    
Direct financing leases 490,747 495,990
Other loan receivables    
Long-term receivable and accrued revenue included in accounts receivable and other assets 14,093 12,175
Performing | Other internal metrics    
Other loan receivables    
Loans to equity-accounted investees and joint venture partners $ 232,489 $ 253,906