Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Condensed Balance Sheet Statements Captions [Line Items]
Current assets	$ 2,392,713	$ 2,376,355
Property and equipment, net	19,711,829	19,635,459
Investments in subsidiaries	0	0
Investments in the MGP Operating Partnership	0	0
Investments in and advances to unconsolidated affiliates	1,050,795	1,033,297
Intercompany accounts	0	0
Other non-current assets	6,142,933	6,114,931
Total assets	29,298,270	29,160,042
Current liabilities	3,586,888	3,138,297
Intercompany accounts	0	0
Deferred income taxes, net	1,206,591	1,295,375
Long-term debt, net	12,742,861	12,751,052
Other long-term obligations	282,879	284,416
Total liabilities	17,819,219	17,469,140
Redeemable noncontrolling interests	78,680	79,778
MGM Resorts International stockholders' equity	7,370,790	7,577,061
Noncontrolling interests	4,029,581	4,034,063
Total stockholders' equity	11,400,371	11,611,124
Total liabilities and stockholders' equity	29,298,270	29,160,042
Reportable Legal Entities [Member] | Parent [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Current assets	108,921	78,909
Property and equipment, net	0	0
Investments in subsidiaries	21,354,482	21,040,147
Investments in the MGP Operating Partnership	0	0
Investments in and advances to unconsolidated affiliates	0	0
Intercompany accounts	0	0
Other non-current assets	58,830	49,142
Total assets	21,522,233	21,168,198
Current liabilities	395,483	153,159
Intercompany accounts	5,894,933	5,783,578
Deferred income taxes, net	902,560	934,966
Long-term debt, net	6,921,359	6,682,574
Other long-term obligations	37,108	36,860
Total liabilities	14,151,443	13,591,137
Redeemable noncontrolling interests	0	0
MGM Resorts International stockholders' equity	7,370,790	7,577,061
Noncontrolling interests	0	0
Total stockholders' equity	7,370,790	7,577,061
Total liabilities and stockholders' equity	21,522,233	21,168,198
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Current assets	957,604	1,015,802
Property and equipment, net	13,521,606	13,521,221
Investments in subsidiaries	3,372,421	3,304,768
Investments in the MGP Operating Partnership	3,533,776	3,549,063
Investments in and advances to unconsolidated affiliates	1,019,970	1,002,903
Intercompany accounts	6,100,695	5,998,499
Other non-current assets	961,851	913,602
Total assets	29,467,923	29,305,858
Current liabilities	1,358,494	1,445,031
Intercompany accounts	0	0
Deferred income taxes, net	0	0
Long-term debt, net	570	2,835
Other long-term obligations	7,254,139	7,268,664
Total liabilities	8,613,203	8,716,530
Redeemable noncontrolling interests	0	0
MGM Resorts International stockholders' equity	20,854,720	20,589,328
Noncontrolling interests	0	0
Total stockholders' equity	20,854,720	20,589,328
Total liabilities and stockholders' equity	29,467,923	29,305,858
Reportable Legal Entities [Member] | Non-Guarantor MGP Subsidiaries [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Current assets	282,698	266,627
Property and equipment, net	9,949,410	10,021,938
Investments in subsidiaries	0	0
Investments in the MGP Operating Partnership	0	0
Investments in and advances to unconsolidated affiliates	0	0
Intercompany accounts	0	0
Other non-current assets	77,886	62,555
Total assets	10,309,994	10,351,120
Current liabilities	146,844	144,537
Intercompany accounts	302	962
Deferred income taxes, net	28,544	28,544
Long-term debt, net	3,925,203	3,934,628
Other long-term obligations	176,555	174,710
Total liabilities	4,277,448	4,283,381
Redeemable noncontrolling interests	0	0
MGM Resorts International stockholders' equity	4,417,275	4,443,089
Noncontrolling interests	1,615,271	1,624,650
Total stockholders' equity	6,032,546	6,067,739
Total liabilities and stockholders' equity	10,309,994	10,351,120
Reportable Legal Entities [Member] | Non-Guarantor Other Subsidiaries [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Current assets	1,045,441	1,022,340
Property and equipment, net	6,201,557	6,125,722
Investments in subsidiaries	0	0
Investments in the MGP Operating Partnership	854,397	862,037
Investments in and advances to unconsolidated affiliates	5,825	5,394
Intercompany accounts	0	0
Other non-current assets	5,088,560	5,134,220
Total assets	13,195,780	13,149,713
Current liabilities	1,898,576	1,609,110
Intercompany accounts	205,460	213,959
Deferred income taxes, net	304,031	360,409
Long-term debt, net	1,895,729	2,131,015
Other long-term obligations	2,300,594	2,305,353
Total liabilities	6,604,390	6,619,846
Redeemable noncontrolling interests	78,680	79,778
MGM Resorts International stockholders' equity	4,098,400	4,040,676
Noncontrolling interests	2,414,310	2,409,413
Total stockholders' equity	6,512,710	6,450,089
Total liabilities and stockholders' equity	13,195,780	13,149,713
Elimination [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Current assets	(1,951)	(7,323)
Property and equipment, net	(9,960,744)	(10,033,422)
Investments in subsidiaries	(24,726,903)	(24,344,915)
Investments in the MGP Operating Partnership	(4,388,173)	(4,411,100)
Investments in and advances to unconsolidated affiliates	25,000	25,000
Intercompany accounts	(6,100,695)	(5,998,499)
Other non-current assets	(44,194)	(44,588)
Total assets	(45,197,660)	(44,814,847)
Current liabilities	(212,509)	(213,540)
Intercompany accounts	(6,100,695)	(5,998,499)
Deferred income taxes, net	(28,544)	(28,544)
Long-term debt, net	0	0
Other long-term obligations	(9,485,517)	(9,501,171)
Total liabilities	(15,827,265)	(15,741,754)
Redeemable noncontrolling interests	0	0
MGM Resorts International stockholders' equity	(29,370,395)	(29,073,093)
Noncontrolling interests	0	0
Total stockholders' equity	(29,370,395)	(29,073,093)
Total liabilities and stockholders' equity	$ (45,197,660)	$ (44,814,847)