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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance $ 12,348,782 $ 10,954,721 $ 12,662,919 $ 10,469,791
Other comprehensive income (loss) 90 (35,106) (61,485) (60,752)
Other changes in accumulated other comprehensive income (loss):        
Ending Balance 11,702,662 10,520,618 11,702,662 10,520,618
MGM Growth Properties LLC [Member] | Class A Shareholders [Member]        
Other changes in accumulated other comprehensive income (loss):        
Share issuances   $ 82,737 507,551 $ 673,779
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance 13,182   (2,747)  
Other comprehensive income (loss) before reclassifications 538   29,163  
Amounts reclassified from accumulated other comprehensive loss to interest expense 0   0  
Other comprehensive income (loss) 538   29,163  
Other changes in accumulated other comprehensive income (loss):        
Redemption of Operating Partnership units     0  
Other     0  
Changes in accumulated other comprehensive income (loss): 538   29,163  
Other comprehensive income attributable to noncontrolling interest (114)   (12,810)  
Ending Balance 13,606   13,606  
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  
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | MGP BREIT Venture [Member]        
Other changes in accumulated other comprehensive income (loss):        
Acquisition transaction     0  
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (60,487)   (10,829)  
Other comprehensive income (loss) before reclassifications (6,852)   (104,355)  
Amounts reclassified from accumulated other comprehensive loss to interest expense 6,404   13,707  
Other comprehensive income (loss) (448)   (90,648)  
Other changes in accumulated other comprehensive income (loss):        
Redemption of Operating Partnership units     0  
Other     0  
Changes in accumulated other comprehensive income (loss): (448)   (90,648)  
Other comprehensive income attributable to noncontrolling interest (316)   40,226  
Ending Balance (61,251)   (61,251)  
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  
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | MGP BREIT Venture [Member]        
Other changes in accumulated other comprehensive income (loss):        
Acquisition transaction     0  
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance 8,275   3,374  
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     4,772  
Other     (458)  
Changes in accumulated other comprehensive income (loss): 0   4,901  
Other comprehensive income attributable to noncontrolling interest 0   0  
Ending Balance 8,275   8,275  
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     646  
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | MGP BREIT Venture [Member]        
Other changes in accumulated other comprehensive income (loss):        
Acquisition transaction     (59)  
AOCI Including Portion Attributable to Noncontrolling Interest        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance (39,030)   (10,202)  
Other comprehensive income (loss) before reclassifications (6,314)   (75,192)  
Amounts reclassified from accumulated other comprehensive loss to interest expense 6,404   13,707  
Other comprehensive income (loss) 90   (61,485)  
Other changes in accumulated other comprehensive income (loss):        
Redemption of Operating Partnership units     4,772  
Other     (458)  
Changes in accumulated other comprehensive income (loss): 90   (56,584)  
Other comprehensive income attributable to noncontrolling interest (430)   27,416  
Ending Balance $ (39,370)   (39,370)  
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     646  
AOCI Including Portion Attributable to Noncontrolling Interest | MGP BREIT Venture [Member]        
Other changes in accumulated other comprehensive income (loss):        
Acquisition transaction     $ (59)