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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 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income Loss [Line Items]            
Beginning Balance $ 10,954,721 $ 11,217,865 $ 10,469,791 $ 10,839,941 $ 10,469,791 $ 11,611,124
Other comprehensive income (loss) (35,106)     16,238 (60,752) 12,677
Ending Balance 10,520,618 10,954,721 11,217,865 $ 10,746,179 10,520,618 $ 10,746,179
Empire City Transaction [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Acquisition transaction     (5,027)      
MGM Growth Properties LLC [Member] | Class A Shareholders [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Share issuance 82,737 62,199 528,843      
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest            
Accumulated Other Comprehensive Income Loss [Line Items]            
Beginning Balance (11,024) (25,778) (18,872)   (18,872)  
Other comprehensive income (loss) before reclassifications (18,602) 26,380 (12,405)      
Amounts reclassified from accumulated other comprehensive loss to interest expense 0 0 0      
Other 0 0 0      
Other comprehensive income (loss) (18,602) 26,380 (12,405)      
Less: Other comprehensive (income) loss attributable to noncontrolling interest 8,093 (11,626) 5,499      
Ending Balance (21,533) (11,024) (25,778)   (21,533)  
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Empire City Transaction [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Acquisition transaction     0      
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Share issuance 0 0 0      
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Park MGM Lease Transaction [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Acquisition transaction     0      
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Northfield OpCo Transaction [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
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 (16,113) 538 9,144   9,144  
Other comprehensive income (loss) before reclassifications (15,223) (24,531) (11,476)      
Amounts reclassified from accumulated other comprehensive loss to interest expense (1,281) (1,767) (1,847)      
Other 0 0 0      
Other comprehensive income (loss) (16,504) (26,298) (13,323)      
Less: Other comprehensive (income) loss attributable to noncontrolling interest 6,233 9,647 4,717      
Ending Balance (26,384) (16,113) 538   (26,384)  
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Empire City Transaction [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
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]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Share issuance 0 0 0      
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Park MGM Lease Transaction [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Acquisition transaction     0      
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Northfield OpCo Transaction [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Acquisition transaction   0        
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest            
Accumulated Other Comprehensive Income Loss [Line Items]            
Beginning Balance 807 632 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      
Other 69 72 23      
Other comprehensive income (loss) 269 175 (540)      
Less: Other comprehensive (income) loss attributable to noncontrolling interest 0 0 0      
Ending Balance 1,076 807 632   1,076  
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Empire City Transaction [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Acquisition transaction     195      
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Share issuance 200 105 (774)      
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Park MGM Lease Transaction [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Acquisition transaction     16      
Accumulated Other Adjustment Including Portion Attributable To Noncontrolling Interest | Northfield OpCo Transaction [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Acquisition transaction   (2)        
AOCI Including Portion Attributable to Noncontrolling Interest            
Accumulated Other Comprehensive Income Loss [Line Items]            
Beginning Balance (26,330) (24,608) (8,556)   (8,556)  
Other comprehensive income (loss) before reclassifications (33,825) 1,849 (23,881)      
Amounts reclassified from accumulated other comprehensive loss to interest expense (1,281) (1,767) (1,847)      
Other 69 72 23      
Other comprehensive income (loss) (34,837) 257 (26,268)      
Less: Other comprehensive (income) loss attributable to noncontrolling interest 14,326 (1,979) 10,216      
Ending Balance (46,841) (26,330) (24,608)   $ (46,841)  
AOCI Including Portion Attributable to Noncontrolling Interest | Empire City Transaction [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Acquisition transaction     195      
AOCI Including Portion Attributable to Noncontrolling Interest | MGM Growth Properties LLC [Member] | Class A Shareholders [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Share issuance $ 200 105 (774)      
AOCI Including Portion Attributable to Noncontrolling Interest | Park MGM Lease Transaction [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Acquisition transaction     $ 16      
AOCI Including Portion Attributable to Noncontrolling Interest | Northfield OpCo Transaction [Member]            
Accumulated Other Comprehensive Income Loss [Line Items]            
Acquisition transaction   $ (2)