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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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance $ 12,662,919 $ 10,469,791 $ 11,611,124
Other comprehensive loss (51,603) (635) (9,446)
Other changes in accumulated other comprehensive loss:      
Ending Balance 11,179,908 12,662,919 10,469,791
MGM Growth Properties LLC [Member] | Class A Shareholders [Member]      
Other changes in accumulated other comprehensive loss:      
Share issuances 507,551 1,201,558  
Empire City Transaction [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction   (5,027)  
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (2,747) (18,872) (11,450)
Other comprehensive income (loss) before reclassifications 27,762 28,870 (13,022)
Amounts reclassified from accumulated other comprehensive loss to interest expense 0 0 0
Amounts reclassified from accumulated other comprehensive loss related to de-designation of interest rate swaps to "Other, net" 0 0  
Other comprehensive loss 27,762 28,870 (13,022)
Other changes in accumulated other comprehensive loss:      
Redemption of Operating Partnership units 0    
Other 0 0  
Changes in accumulated other comprehensive loss 27,762 28,870  
Other comprehensive (income) loss attributable to noncontrolling interest (12,051) (12,745) 5,600
Ending Balance 12,964 (2,747) (18,872)
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 loss:      
Share issuances 0 0  
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Empire City Transaction [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction   0  
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Park MGM Transaction [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction   0  
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Northfield OpCo [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction   0  
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | MGP BREIT Venture [Member]      
Other changes in accumulated other comprehensive 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 (10,829) 9,144 6,668
Other comprehensive income (loss) before reclassifications (94,740) (28,783) 4,706
Amounts reclassified from accumulated other comprehensive loss to interest expense 17,922 (5,599) (1,130)
Amounts reclassified from accumulated other comprehensive loss related to de-designation of interest rate swaps to "Other, net" (2,547) 4,877  
Other comprehensive loss (79,365) (29,505) 3,576
Other changes in accumulated other comprehensive loss:      
Redemption of Operating Partnership units 0    
Other 0 0  
Changes in accumulated other comprehensive loss (79,365) (29,505)  
Other comprehensive (income) loss attributable to noncontrolling interest 34,837 9,532 (1,100)
Ending Balance (55,357) (10,829) 9,144
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 loss:      
Share issuances 0 0  
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Empire City Transaction [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction   0  
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Park MGM Transaction [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction   0  
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Northfield OpCo [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction   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 loss:      
Acquisition transaction 0    
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance 3,374 1,172 1,172
Other comprehensive income (loss) before reclassifications 0 0 0
Amounts reclassified from accumulated other comprehensive loss to interest expense 0 0 0
Amounts reclassified from accumulated other comprehensive loss related to de-designation of interest rate swaps to "Other, net" 0 0  
Other comprehensive loss 0 0 0
Other changes in accumulated other comprehensive loss:      
Redemption of Operating Partnership units 8,773    
Other (1,018) 481  
Changes in accumulated other comprehensive loss 8,342 2,202  
Other comprehensive (income) loss attributable to noncontrolling interest 0 0 0
Ending Balance 11,716 3,374 1,172
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member]      
Other changes in accumulated other comprehensive loss:      
Share issuances 646 1,512  
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Empire City Transaction [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction   195  
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Park MGM Transaction [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction   16  
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Northfield OpCo [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction   (2)  
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | MGP BREIT Venture [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction (59)    
AOCI Including Portion Attributable to Noncontrolling Interest      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (10,202) (8,556) (3,610)
Other comprehensive income (loss) before reclassifications (66,978) 87 (8,316)
Amounts reclassified from accumulated other comprehensive loss to interest expense 17,922 (5,599) (1,130)
Amounts reclassified from accumulated other comprehensive loss related to de-designation of interest rate swaps to "Other, net" (2,547) 4,877  
Other comprehensive loss (51,603) (635) (9,446)
Other changes in accumulated other comprehensive loss:      
Redemption of Operating Partnership units 8,773    
Other (1,018) 481  
Changes in accumulated other comprehensive loss (43,261) 1,567  
Other comprehensive (income) loss attributable to noncontrolling interest 22,786 (3,213) 4,500
Ending Balance (30,677) (10,202) $ (8,556)
AOCI Including Portion Attributable to Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member]      
Other changes in accumulated other comprehensive loss:      
Share issuances 646 1,512  
AOCI Including Portion Attributable to Noncontrolling Interest | Empire City Transaction [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction   195  
AOCI Including Portion Attributable to Noncontrolling Interest | Park MGM Transaction [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction   16  
AOCI Including Portion Attributable to Noncontrolling Interest | Northfield OpCo [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction   $ (2)  
AOCI Including Portion Attributable to Noncontrolling Interest | MGP BREIT Venture [Member]      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction $ (59)