Investments in Unconsolidated Entities - Summarized Operating Data With Reconciliation To Income From Unconsolidated Entities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Schedule Of Equity Method Investments [Line Items]
Income from unconsolidated entities	$ 13,269	$ 0
BREIT MGP JV [Member]
Schedule Of Equity Method Investments [Line Items]
Net income	26,632
Income from unconsolidated entities	13,269
BREIT MGP JV [Member] | BREIT's Share [Member]
Schedule Of Equity Method Investments [Line Items]
Income from unconsolidated entities	13,289
BREIT MGP JV [Member] | BREIT Outside Basis [Member]
Schedule Of Equity Method Investments [Line Items]
Income from unconsolidated entities	(20)
BREIT MGP JV [Member] | MGM Growth Properties LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Income from unconsolidated entities	13,343
BREIT MGP JV [Member] | Rental [Member]
Schedule Of Equity Method Investments [Line Items]
Total revenue	$ 50,437