Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Loss Attributable to MGM Resorts International by Component (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 11,179,908	$ 12,662,919
Other comprehensive income (loss)	2,276	(54,750)
Other changes in accumulated other comprehensive income (loss):
Ending Balance	11,232,519	13,332,001
MGM Growth Properties LLC [Member] | Class A Shareholders [Member]
Other changes in accumulated other comprehensive income (loss):
Share issuance	647,754	$ 507,551
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	12,964
Other comprehensive income (loss) before reclassifications	(13,022)
Amounts reclassified from accumulated other comprehensive loss to interest expense	0
Other comprehensive income (loss)	(13,022)
Other changes in accumulated other comprehensive income (loss):
Redemption of Operating Partnership units	0
Other	0
Changes in accumulated other comprehensive income (loss):	(13,022)
Other comprehensive loss (income) attributable to noncontrolling interest	5,669
Ending Balance	5,611
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member]
Other changes in accumulated other comprehensive income (loss):
Share issuance	0
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(55,357)
Other comprehensive income (loss) before reclassifications	10,680
Amounts reclassified from accumulated other comprehensive loss to interest expense	4,618
Other comprehensive income (loss)	15,298
Other changes in accumulated other comprehensive income (loss):
Redemption of Operating Partnership units	0
Other	0
Changes in accumulated other comprehensive income (loss):	15,298
Other comprehensive loss (income) attributable to noncontrolling interest	(8,199)
Ending Balance	(48,258)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member]
Other changes in accumulated other comprehensive income (loss):
Share issuance	0
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	11,716
Other comprehensive income (loss) before reclassifications	0
Amounts reclassified from accumulated other comprehensive loss to interest expense	0
Other comprehensive income (loss)	0
Other changes in accumulated other comprehensive income (loss):
Redemption of Operating Partnership units	5,327
Other	(2,482)
Changes in accumulated other comprehensive income (loss):	5,713
Other comprehensive loss (income) attributable to noncontrolling interest	0
Ending Balance	17,429
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member]
Other changes in accumulated other comprehensive income (loss):
Share issuance	2,868
AOCI Including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(30,677)
Other comprehensive income (loss) before reclassifications	(2,342)
Amounts reclassified from accumulated other comprehensive loss to interest expense	4,618
Other comprehensive income (loss)	2,276
Other changes in accumulated other comprehensive income (loss):
Redemption of Operating Partnership units	5,327
Other	(2,482)
Changes in accumulated other comprehensive income (loss):	7,989
Other comprehensive loss (income) attributable to noncontrolling interest	(2,530)
Ending Balance	(25,218)
AOCI Including Portion Attributable to Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member]
Other changes in accumulated other comprehensive income (loss):
Share issuance	$ 2,868