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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance $ 11,104,122 $ 12,348,782 $ 11,179,908 $ 12,662,919
Other comprehensive income (loss) (4,715) 90 5,462 (61,485)
Other changes in accumulated other comprehensive income (loss):        
Ending Balance 11,660,977 $ 11,702,662 11,660,977 11,702,662
MGM Growth Properties LLC | Class A Shareholders        
Other changes in accumulated other comprehensive income (loss):        
MGP Class A share issuances 271   759,535 $ 507,551
Currency Translation Adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance 8,844   12,964  
Other comprehensive income (loss) before reclassifications (11,956)   (19,167)  
Amounts reclassified from accumulated other comprehensive loss to interest expense 0   0  
Other comprehensive income (loss) (11,956)   (19,167)  
Other changes in accumulated other comprehensive income (loss):        
Redemption of Operating Partnership units     0  
Other     0  
Changes in accumulated other comprehensive loss: (11,956)   (19,167)  
Other comprehensive loss (income) attributable to noncontrolling interest 5,270   8,361  
Ending Balance 2,158   2,158  
Currency Translation Adjustments | MGM Growth Properties LLC | Class A Shareholders        
Other changes in accumulated other comprehensive income (loss):        
MGP Class A share issuances 0   0  
Cash Flow Hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance (47,826)   (55,357)  
Other comprehensive income (loss) before reclassifications 1,818   7,824  
Amounts reclassified from accumulated other comprehensive loss to interest expense 5,423   16,805  
Other comprehensive income (loss) 7,241   24,629  
Other changes in accumulated other comprehensive income (loss):        
Redemption of Operating Partnership units     0  
Other     0  
Changes in accumulated other comprehensive loss: 7,241   24,629  
Other comprehensive loss (income) attributable to noncontrolling interest (4,656)   (14,513)  
Ending Balance (45,241)   (45,241)  
Cash Flow Hedges | MGM Growth Properties LLC | Class A Shareholders        
Other changes in accumulated other comprehensive income (loss):        
MGP Class A share issuances 0   0  
Other        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance 17,809   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):        
Redemption of Operating Partnership units     5,327  
Other     (2,473)  
Changes in accumulated other comprehensive loss: 1   6,094  
Other comprehensive loss (income) attributable to noncontrolling interest 0   0  
Ending Balance 17,810   17,810  
Other | MGM Growth Properties LLC | Class A Shareholders        
Other changes in accumulated other comprehensive income (loss):        
MGP Class A share issuances 1   3,240  
Total        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance (21,173)   (30,677)  
Other comprehensive income (loss) before reclassifications (10,138)   (11,343)  
Amounts reclassified from accumulated other comprehensive loss to interest expense 5,423   16,805  
Other comprehensive income (loss) (4,715)   5,462  
Other changes in accumulated other comprehensive income (loss):        
Redemption of Operating Partnership units     5,327  
Other     (2,473)  
Changes in accumulated other comprehensive loss: (4,714)   11,556  
Other comprehensive loss (income) attributable to noncontrolling interest 614   (6,152)  
Ending Balance (25,273)   (25,273)  
Total | MGM Growth Properties LLC | Class A Shareholders        
Other changes in accumulated other comprehensive income (loss):        
MGP Class A share issuances $ 1   $ 3,240