Investments in Unconsolidated Entities - Summarized Operating Data With Reconciliation To Income From Unconsolidated Entities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Schedule Of Equity Method Investments [Line Items]
Net income	$ 122,469	$ (126,494)	$ (776,349)	$ (229,374)
Income from unconsolidated entities			63,678	$ 0
BREIT MGP JV [Member]
Schedule Of Equity Method Investments [Line Items]
Net income	50,320		127,799
Income from unconsolidated entities	25,073		63,678
BREIT MGP JV [Member] | BREIT's Share [Member]
Schedule Of Equity Method Investments [Line Items]
Income from unconsolidated entities	25,110		63,772
BREIT MGP JV [Member] | BREIT Outside Basis [Member]
Schedule Of Equity Method Investments [Line Items]
Income from unconsolidated entities	(37)		(94)
BREIT MGP JV [Member] | MGM Growth Properties LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Income from unconsolidated entities	25,210		64,027
BREIT MGP JV [Member] | Rental [Member]
Schedule Of Equity Method Investments [Line Items]
Total revenue	$ 98,682		$ 247,800