Investments in Unconsolidated Entities - Summarized Balance Sheet with Reconciliation To Equity Investment In Unconsolidated Entities (Detail) $ in Thousands	Mar. 31, 2020 USD ($)
Schedule Of Equity Method Investments [Line Items]
Investments in unconsolidated entities	$ 809,452
BREIT MGP JV [Member]
Schedule Of Equity Method Investments [Line Items]
Total assets	4,604,815
Total liabilities	(3,001,698)
Total equity	1,603,117
Investments in unconsolidated entities	809,452
BREIT MGP JV [Member] | BREIT's Share [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in unconsolidated entities	799,955
BREIT MGP JV [Member] | BREIT Outside Basis [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in unconsolidated entities	9,497
BREIT MGP JV [Member] | MGM Growth Properties LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in unconsolidated entities	$ 803,162