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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands				1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 04, 2021	Aug. 03, 2021	Mar. 15, 2021	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Feb. 29, 2020	May 31, 2018
Stockholders Equity Note [Line Items]
Cash proceeds for redemption						$ 3,205,000	$ 50,828,000	$ 3,205,000
Common stock repurchases, value					$ 220,392,000		339,661,000	353,720,000
Common Stock [Member]
Stockholders Equity Note [Line Items]
Cash proceeds for redemption						$ 0	$ 0	$ 0
Common stock repurchases, Shares					5,582		8,732	10,861
Common stock repurchases, value					$ 56,000		$ 87,000	$ 109,000
Share Repurchase Program [Member] | Common Stock [Member]
Stockholders Equity Note [Line Items]
Authorized amount of stock repurchase										$ 2,000,000,000.0
Share Repurchase Program Two [Member] | Common Stock [Member]
Stockholders Equity Note [Line Items]
Authorized amount of stock repurchase									$ 3,000,000,000.0
Repurchase of common stock, remaining amount					$ 2,700,000,000		$ 2,700,000,000
Share Repurchase Program [Member] | Common Stock [Member]
Stockholders Equity Note [Line Items]
Common stock repurchases, Shares					6,000	0	9,000	11,000
Stock repurchased, average price per share					$ 39.48		$ 38.90	$ 32.57
Common stock repurchases, value					$ 220,000,000		$ 340,000,000	$ 354,000,000
Subsequent Event [Member]
Stockholders Equity Note [Line Items]
Dividend declared date	Aug. 04, 2021
Dividends declared per share	$ 0.0025
Dividend paid date	Sep. 15, 2021
Dividend record date	Sep. 10, 2021
Subsequent Event [Member] | Share Repurchase Program [Member] | Common Stock [Member]
Stockholders Equity Note [Line Items]
Common stock repurchases, Shares		7,000
Stock repurchased, average price per share		$ 38.72
Common stock repurchases, value		$ 275,000,000
MGM Growth Properties LLC [Member] | Operating Partnership [Member]
Stockholders Equity Note [Line Items]
Partnership interest			42.10%	42.10%
Operating partnership units, redeemed				37,000
Operating partnership units, redeemed for cash				15,000
Operating partnership units, redeemed for Class A offering				22,000
Cash proceeds for redemption				$ 1,200,000,000
MGM Growth Properties LLC [Member] | Class A shares [Member]
Stockholders Equity Note [Line Items]
New issuance of shares			22,000		3,000
Issuance of operating partnership units					3,000
MGM Growth Properties LLC [Member] | Class A shares [Member] | Operating Partnership [Member] | Subsequent Event [Member]
Stockholders Equity Note [Line Items]
Partnership interest		41.60%

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