Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	MGP BREIT Venture [Member]	MGM Growth Properties LLC [Member] Class A Shareholders [Member]	Common Stock [Member]	Common Stock [Member] MGP BREIT Venture [Member]	Common Stock [Member] MGM Growth Properties LLC [Member] Class A Shareholders [Member]	Capital in Excess of Par Value [Member]	Capital in Excess of Par Value [Member] MGP BREIT Venture [Member]	Capital in Excess of Par Value [Member] MGM Growth Properties LLC [Member] Class A Shareholders [Member]	Retained Earnings [Member]	Retained Earnings [Member] MGP BREIT Venture [Member]	Retained Earnings [Member] MGM Growth Properties LLC [Member] Class A Shareholders [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Other Comprehensive Loss [Member] MGP BREIT Venture [Member]	Accumulated Other Comprehensive Loss [Member] MGM Growth Properties LLC [Member] Class A Shareholders [Member]	Total MGM Resorts International Stockholder's Equity [Member]	Total MGM Resorts International Stockholder's Equity [Member] MGP BREIT Venture [Member]	Total MGM Resorts International Stockholder's Equity [Member] MGM Growth Properties LLC [Member] Class A Shareholders [Member]	Non-Controlling Interests [Member]	Non-Controlling Interests [Member] MGP BREIT Venture [Member]	Non-Controlling Interests [Member] MGM Growth Properties LLC [Member] Class A Shareholders [Member]
Beginning Balance at Dec. 31, 2019	$ 12,662,919			$ 5,031			$ 3,531,099			$ 4,201,337			$ (10,202)			$ 7,727,265			$ 4,935,654
Beginning Balance, Shares at Dec. 31, 2019				503,148
Net income (loss)	672,651			$ 0			0			806,869			0			806,869			(134,218)
Currency translation adjustment	28,336			0			0			0			15,807			15,807			12,529
Cash flow hedges	(83,086)			0			0			0			(45,555)			(45,555)			(37,531)
Stock-based compensation	36,898			0			35,626			0			0			35,626			1,272
Issuance of common stock pursuant to stock-based compensation awards	(6,426)			$ 10			(6,436)			0			0			(6,426)			0
Issuance of common stock pursuant to stock-based compensation awards, Shares				868
Cash distributions and dividend payable to noncontrolling interest owners	(7,962)		$ (62,389)	$ 0		$ 0	0		$ 0	0		$ 0	0		$ 0	0		$ 0	(7,962)		$ (62,389)
Dividends declared and paid to common shareholders	(73,904)			0			0			(73,904)			0			(73,904)			0
Issuance of restricted stock units	2,142			0			2,142			0			0			2,142			0
Repurchases of common stock	(353,720)			$ (109)			(353,611)			0			0			(353,720)			0
Repurchases of common stock, Shares				(10,861)
Transaction		$ 1,725			$ 0			$ (6,503)			$ 0			$ (59)			$ (6,562)			$ 8,287
Share issuances			507,551			0			64,188			0			646			64,834			442,717
Adjustment of redeemable noncontrolling interest to redemption value	8,070			$ 0			8,070			0			0			8,070			0
Other	(804)			0			(121)			0			(411)			(532)			(272)
Ending Balance at Mar. 31, 2020	13,332,001			$ 4,932			3,274,454			4,934,302			(39,774)			8,173,914			5,158,087
Ending Balance, Shares at Mar. 31, 2020				493,155
Beginning Balance at Dec. 31, 2020	11,179,908			$ 4,943			3,439,453			3,091,007			(30,677)			6,504,726			4,675,182
Beginning Balance, Shares at Dec. 31, 2020				494,318
Net income (loss)	(338,083)			$ 0			0			(331,829)			0			(331,829)			(6,254)
Currency translation adjustment	(13,022)			0			0			0			(7,353)			(7,353)			(5,669)
Cash flow hedges	15,298			0			0			0			7,099			7,099			8,199
Stock-based compensation	16,549			0			15,503			0			0			15,503			1,046
Issuance of common stock pursuant to stock-based compensation awards	(9,344)			$ 7			(9,351)			0			0			(9,344)			0
Issuance of common stock pursuant to stock-based compensation awards, Shares				706
Cash distributions and dividend payable to noncontrolling interest owners	(3,112)		(75,895)	$ 0		0	0		0	0		0	0		0	0		0	(3,112)		(75,895)
Dividends declared and paid to common shareholders	(1,237)			0			0			(1,237)			0			(1,237)			0
Repurchases of common stock	(119,269)			$ (31)			(119,238)			0			0			(119,269)			0
Repurchases of common stock, Shares				(3,150)
Share issuances			$ 647,754			$ 0			$ 83,142			$ 0			$ 2,868			$ 86,010			$ 561,744
Redemption of Operating Partnership units	(50,828)			$ 0			171,332			0			5,327			176,659			(227,487)
Adjustment of redeemable noncontrolling interest to redemption value	(9,428)			0			(9,428)			0			0			(9,428)			0
Other	(6,772)			0			(2,227)			0			(2,482)			(4,709)			(2,063)
Ending Balance at Mar. 31, 2021	$ 11,232,519			$ 4,919			$ 3,569,186			$ 2,757,941			$ (25,218)			$ 6,306,828			$ 4,925,691
Ending Balance, Shares at Mar. 31, 2021				491,874