SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts:
Balance at Beginning of Period	$ 109,180	$ 185,913	$ 9,089
Charged to Provision Accounts	7,917	33,857	212,779
Deductions or Other	111,975	110,590	35,955
Balance at End of Period	5,122	109,180	185,913
Allowance for Contractual Receivables [Member]
Allowance for doubtful accounts:
Balance at Beginning of Period	1,075	8,463	299
Charged to Provision Accounts		(4,226)	8,491
Deductions or Other	1,075	3,162	327
Balance at End of Period		1,075	8,463
Allowance Other Receivables and Lease Inducements [Member]
Allowance for doubtful accounts:
Balance at Beginning of Period		0	58
Charged to Provision Accounts		10,962	4,901
Deductions or Other		10,962	4,959
Balance at End of Period			0
Allowance for Mortagage Notes Receivable [Member]
Allowance for doubtful accounts:
Balance at Beginning of Period	4,905	4,905	3,934
Charged to Provision Accounts			971
Deductions or Other	0	0	0
Balance at End of Period	4,905	4,905	4,905
Allowance For Doubtful Accounts Other Investments [Member]
Allowance for doubtful accounts:
Balance at Beginning of Period		373	4,798
Charged to Provision Accounts		(47)	217
Deductions or Other		326	4,642
Balance at End of Period			373
Allowance For Doubtful Accounts Direct Financing Leases [Member]
Allowance for doubtful accounts:
Balance at Beginning of Period	103,200	172,172	0
Charged to Provision Accounts	7,917	27,168	198,199
Deductions or Other	110,900	96,140	26,027
Balance at End of Period	$ 217	$ 103,200	$ 172,172