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Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Loss Attributable to MGM Resorts International by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance $ 11,232,519 $ 13,332,001 $ 11,179,908 $ 12,662,919
Other comprehensive income (loss) 7,901 (6,825) 10,177 (61,575)
Other changes in accumulated other comprehensive income (loss):        
Ending Balance 11,104,122 $ 12,348,782 11,104,122 12,348,782
MGM Growth Properties LLC [Member] | Class A Shareholders [Member]        
Other changes in accumulated other comprehensive income (loss):        
Share issuances 111,510   759,264 $ 507,551
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance 5,611   12,964  
Other comprehensive income (loss) before reclassifications 5,811   (7,211)  
Amounts reclassified from accumulated other comprehensive loss to interest expense 0   0  
Other comprehensive income (loss) 5,811   (7,211)  
Other changes in accumulated other comprehensive income (loss):        
Other 0   0  
Redemption of Operating Partnership units     0  
Changes in accumulated other comprehensive income (loss): 5,811   (7,211)  
Other comprehensive loss (income) attributable to noncontrolling interest (2,578)   3,091  
Ending Balance 8,844   8,844  
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 issuances 0   0  
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (48,258)   (55,357)  
Other comprehensive income (loss) before reclassifications (4,674)   6,006  
Amounts reclassified from accumulated other comprehensive loss to interest expense 6,764   11,382  
Other comprehensive income (loss) 2,090   17,388  
Other changes in accumulated other comprehensive income (loss):        
Other 0   0  
Redemption of Operating Partnership units     0  
Changes in accumulated other comprehensive income (loss): 2,090   17,388  
Other comprehensive loss (income) attributable to noncontrolling interest (1,658)   (9,857)  
Ending Balance (47,826)   (47,826)  
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 issuances 0   0  
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance 17,429   11,716  
Other comprehensive income (loss) before reclassifications 0   0  
Amounts reclassified from accumulated other comprehensive loss to interest expense 0   0  
Other comprehensive income (loss) 0   0  
Other changes in accumulated other comprehensive income (loss):        
Other 9   (2,473)  
Redemption of Operating Partnership units     5,327  
Changes in accumulated other comprehensive income (loss): 380   6,093  
Other comprehensive loss (income) attributable to noncontrolling interest 0   0  
Ending Balance 17,809   17,809  
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 issuances 371   3,239  
AOCI Including Portion Attributable to Noncontrolling Interest        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (25,218)   (30,677)  
Other comprehensive income (loss) before reclassifications 1,137   (1,205)  
Amounts reclassified from accumulated other comprehensive loss to interest expense 6,764   11,382  
Other comprehensive income (loss) 7,901   10,177  
Other changes in accumulated other comprehensive income (loss):        
Other 9   (2,473)  
Redemption of Operating Partnership units     5,327  
Changes in accumulated other comprehensive income (loss): 8,281   16,270  
Other comprehensive loss (income) attributable to noncontrolling interest (4,236)   (6,766)  
Ending Balance (21,173)   (21,173)  
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 issuances $ 371   $ 3,239