Subsequent Events - Additional Information (Detail) $ in Thousands			1 Months Ended	9 Months Ended
	Oct. 15, 2019 USD ($) ft² a Room Option	Oct. 01, 2019 USD ($) Transaction	Nov. 13, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Subsequent Event [Line Items]
Proceeds from issuance of common stock				$ 4,913,617	$ 1,948,928
Subsequent Event [Member]
Subsequent Event [Line Items]
Aggregate payments to acquire real estate, exclusive of closing costs		$ 1,000
Number of separate transaction in real estate acquisition | Transaction		11
Proceeds from issuance of common stock			$ 1,600,000
Subsequent Event [Member] | Real Estate-Related Securities and Loans [Member]
Subsequent Event [Line Items]
Acquisition of real estate-related securities		$ 458,800
The Bellagio Real Estate [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Ownership Interest	95.00%
The Bellagio Real Estate [Member] | MGM Resorts International [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Aggregate payments to acquire real estate, exclusive of closing costs	$ 4,250,000
Ownership Interest	5.00%
Area of a real estate property | a	77
Number of hotel rooms | Room	3,933
Area of gaming floor | ft²	155,000
Area of retail space | ft²	94,000
Area of meeting and ballroom space | ft²	200,000
Lease, initial annual rent	$ 245,000
Lease, initial term	30 years
Lease, existence of option to extend	true
Lease, description of option to extend	The lease is expected to have an initial annual rent of $245 million with an initial term of 30 years with two 10-year extension options for MGM.
Lease, extension term	10 years
Lease, number of extension options | Option	2