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Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Income Attributable to MGM Resorts International by Component (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance $ 12,662,919 $ 10,469,791  
Other comprehensive loss (54,750) (25,728)  
Other changes in accumulated other comprehensive income (loss):      
Accumulated other comprehensive loss (39,774)   $ (10,202)
Ending Balance 13,332,001 11,217,865  
MGM Growth Properties LLC [Member] | Class A Shareholders [Member]      
Other changes in accumulated other comprehensive income (loss):      
Share issuance 507,551 $ 528,843  
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (2,747)    
Other comprehensive income (loss) before reclassifications 28,336    
Amounts reclassified from accumulated other comprehensive income to interest expense 0    
Other comprehensive loss 28,336    
Other changes in accumulated other comprehensive income (loss):      
Other 0    
Accumulated other comprehensive loss 28,336    
Other comprehensive income (loss) attributable to noncontrolling interest (12,529)    
Ending Balance 13,060    
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 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 issuance 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)    
Other comprehensive income (loss) before reclassifications (84,549)    
Amounts reclassified from accumulated other comprehensive income to interest expense 1,463    
Other comprehensive loss (83,086)    
Other changes in accumulated other comprehensive income (loss):      
Other 0    
Accumulated other comprehensive loss (83,086)    
Other comprehensive income (loss) attributable to noncontrolling interest 37,531    
Ending Balance (56,384)    
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 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 issuance 0    
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance 3,374    
Other comprehensive income (loss) before reclassifications 0    
Amounts reclassified from accumulated other comprehensive income to interest expense 0    
Other comprehensive loss 0    
Other changes in accumulated other comprehensive income (loss):      
Other (411)    
Accumulated other comprehensive loss 176    
Other comprehensive income (loss) attributable to noncontrolling interest 0    
Ending Balance 3,550    
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | MGP BREIT Venture [Member]      
Other changes in accumulated other comprehensive income (loss):      
Acquisition transaction (59)    
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 issuance 646    
AOCI Including Portion Attributable to Noncontrolling Interest      
Accumulated Other Comprehensive Income Loss [Line Items]      
Beginning Balance (10,202)    
Other comprehensive income (loss) before reclassifications (56,213)    
Amounts reclassified from accumulated other comprehensive income to interest expense 1,463    
Other comprehensive loss (54,750)    
Other changes in accumulated other comprehensive income (loss):      
Other (411)    
Accumulated other comprehensive loss (54,574)    
Other comprehensive income (loss) attributable to noncontrolling interest 25,002    
Ending Balance (39,774)    
AOCI 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 | MGM Growth Properties LLC [Member] | Class A Shareholders [Member]      
Other changes in accumulated other comprehensive income (loss):      
Share issuance $ 646