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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands		1 Months Ended			3 Months Ended					9 Months Ended
	Oct. 30, 2019	Apr. 30, 2019	Mar. 31, 2019	Jan. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	May 31, 2018	Sep. 30, 2017
Stockholders Equity Note [Line Items]
Common stock repurchases, value					$ 356,982,000	$ 281,833,000	$ 176,070,000	$ 594,864,000	$ 362,400,000
Common Stock [Member]
Stockholders Equity Note [Line Items]
Common stock repurchases, Shares					12,599	11,005	6,103	19,004	10,000
Common stock repurchases, value					$ 126,000	$ 110,000	$ 61,000	$ 190,000	$ 100,000
Share Repurchase Program [Member] | Common Stock [Member]
Stockholders Equity Note [Line Items]
Authorized amount of stock repurchase												$ 2,000,000,000.0
Repurchase of common stock, remaining amount					$ 750,000,000					$ 750,000,000
Share Repurchase Program Two [Member]
Stockholders Equity Note [Line Items]
Authorized amount of stock repurchase													$ 1,000,000,000.0
Share Repurchase Program [Member] | Common Stock [Member]
Stockholders Equity Note [Line Items]
Common stock repurchases, Shares					13,000		6,000			24,000	35,000
Average price per share					$ 28.33		$ 28.87			$ 27.06	$ 32.29
Common stock repurchases, value					$ 357,000,000		$ 176,000,000			$ 639,000,000	$ 1,100,000,000
Subsequent Event [Member]
Stockholders Equity Note [Line Items]
Dividend declared date	Oct. 30, 2019
Dividend paid date	Dec. 16, 2019
Dividend record date	Dec. 10, 2019
Dividends declared per share	$ 0.13
MGM Growth Properties LLC [Member]
Stockholders Equity Note [Line Items]
Issuance of operating partnership units		9,000	1,000
Partnership interest		68.80%	69.80%	74.60%	67.70%					67.70%
MGM Growth Properties LLC [Member] | Class A shares [Member]
Stockholders Equity Note [Line Items]
Issuance of operating partnership units				20,000	3,000					5,000
Partnership interest				69.70%	67.70%					67.70%
New issuance of shares				20,000	3,000					5,000
MGM Growth Properties LLC [Member] | Empire City [Member]
Stockholders Equity Note [Line Items]
Issuance of operating partnership units				13,000

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