Subsequent Events - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended
		Oct. 31, 2019	Mar. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Loan for construction of property				$ 3,699,007
Mortgage and other notes receivable	[1]			5,818	$ 7,672
Attorney and administrative fees			$ 88,150
Mortgages
Subsequent Event [Line Items]
Mortgage and other notes receivable				$ 3,604	$ 4,884
Subsequent Event | Wave Lengths Hair Salons Of Florida Inc.
Subsequent Event [Line Items]
Attorney and administrative fees		$ 23,050
Subsequent Event | Aloft by Marriott
Subsequent Event [Line Items]
Loan for construction of property		16,800
Subsequent Event | Village Square | Mortgages
Subsequent Event [Line Items]
Mortgage and other notes receivable		$ 910

[1] As of September 30, 2019, includes $484,345 of assets related to consolidated variable interest entities that can be used only to settle obligations of the consolidated variable interest entities and $346,999 of liabilities of consolidated variable interest entities for which creditors do not have recourse to the general credit of the Company. See Note 7.