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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance $ 11,179,908 $ 12,662,919 $ 10,469,791
Other comprehensive income (loss) before reclassifications (12,067) (66,978) 87
Amounts reclassified from accumulated other comprehensive loss to interest expense 22,200 17,922 (5,599)
Amounts reclassified from accumulated other comprehensive loss related to de-designation of interest rate swaps to "Other, net"   (2,547) 4,877
Other comprehensive income (loss) 10,133 (51,603) (635)
Other changes in accumulated other comprehensive loss:      
MGP Class A share issuance 3,240 646 1,512
Acquisition transaction   (59)  
Redemption of Operating Partnership units 5,327 8,773  
Other (2,358) (1,018) 481
Changes in accumulated other comprehensive loss 16,342 (43,261) 1,567
Other comprehensive (income) loss attributable to noncontrolling interest (10,281) 22,786 (3,213)
Ending Balance 10,976,766 11,179,908 12,662,919
Empire City Transaction      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction     5,027
MGM Growth Properties LLC | Class A Shareholders      
Other changes in accumulated other comprehensive loss:      
MGP Class A share issuance 759,535 507,551 1,201,558
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance 12,964 (2,747) (18,872)
Other comprehensive income (loss) before reclassifications (24,655) 27,762 28,870
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 income (loss) (24,655) 27,762 28,870
Other changes in accumulated other comprehensive loss:      
Redemption of Operating Partnership units 0 0  
Other 0 0 0
Changes in accumulated other comprehensive loss (24,655) 27,762 28,870
Other comprehensive (income) loss attributable to noncontrolling interest 10,784 (12,051) (12,745)
Ending Balance (907) 12,964 (2,747)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Empire City Transaction      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction     0
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | MGM Growth Properties LLC | Class A Shareholders      
Other changes in accumulated other comprehensive loss:      
MGP Class A share issuance 0 0 0
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Park MGM Transaction      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction     0
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Northfield OpCo      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction     0
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | MGP BREIT Venture      
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 (55,357) (10,829) 9,144
Other comprehensive income (loss) before reclassifications 12,588 (94,740) (28,783)
Amounts reclassified from accumulated other comprehensive loss to interest expense 22,200 17,922 (5,599)
Amounts reclassified from accumulated other comprehensive loss related to de-designation of interest rate swaps to "Other, net"   (2,547) 4,877
Other comprehensive income (loss) 34,788 (79,365) (29,505)
Other changes in accumulated other comprehensive loss:      
Redemption of Operating Partnership units 0 0  
Other 0 0 0
Changes in accumulated other comprehensive loss 34,788 (79,365) (29,505)
Other comprehensive (income) loss attributable to noncontrolling interest (21,065) 34,837 9,532
Ending Balance (41,634) (55,357) (10,829)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Empire City Transaction      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction     0
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | MGM Growth Properties LLC | Class A Shareholders      
Other changes in accumulated other comprehensive loss:      
MGP Class A share issuance 0 0 0
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Park MGM Transaction      
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      
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      
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 11,716 3,374 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 income (loss) 0 0 0
Other changes in accumulated other comprehensive loss:      
Redemption of Operating Partnership units 5,327 8,773  
Other (2,358) (1,018) 481
Changes in accumulated other comprehensive loss 6,209 8,342 2,202
Other comprehensive (income) loss attributable to noncontrolling interest 0 0 0
Ending Balance 17,925 11,716 3,374
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Empire City Transaction      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction     195
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | MGM Growth Properties LLC | Class A Shareholders      
Other changes in accumulated other comprehensive loss:      
MGP Class A share issuance 3,240 646 1,512
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Park MGM Transaction      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction     16
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Northfield OpCo      
Other changes in accumulated other comprehensive loss:      
Acquisition transaction     (2)
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | MGP BREIT Venture      
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 (30,677) (10,202) (8,556)
Other changes in accumulated other comprehensive loss:      
Ending Balance $ (24,616) $ (30,677) $ (10,202)