SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful accounts:
Balance at Beginning of Period	$ 185,913	$ 9,089	$ 3,269
Charged to Provision Accounts	33,857	212,779	9,845
Deductions or Other	110,590	35,955	4,025
Balance at End of Period	109,180	185,913	9,089
Allowance for Accounts Receivables [Member]
Allowance for doubtful accounts:
Balance at Beginning of Period	8,463	357	309
Charged to Provision Accounts	6,736	13,392	4,246
Deductions or Other	14,124	5,286	4,198
Balance at End of Period	1,075	8,463	357
Allowance for Mortagage Notes Receivable [Member]
Allowance for doubtful accounts:
Balance at Beginning of Period	4,905	3,934	0
Charged to Provision Accounts		971	3,934
Deductions or Other	0	0	0
Balance at End of Period	4,905	4,905	3,934
Allowance For Doubtful Accounts Other Investments [Member]
Allowance for doubtful accounts:
Balance at Beginning of Period	373	4,798	2,960
Charged to Provision Accounts	(47)	217	1,665
Deductions or Other	326	4,642	(173)
Balance at End of Period		373	4,798
Allowance For Doubtful Accounts Direct Financing Leases [Member]
Allowance for doubtful accounts:
Balance at Beginning of Period	172,172	0
Charged to Provision Accounts	27,168	198,199
Deductions or Other	96,140	26,027
Balance at End of Period	$ 103,200	$ 172,172	$ 0