Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, Gross	$ 13,386,387	$ 13,018,276
Less: Premiums, discounts, and unamortized debt issuance costs, net	(103,918)	(109,182)
Long-term debt	13,282,469	12,909,094
Less: Current portion of long-term debt, net	(539,608)	(158,042)
Long-term debt, net	12,742,861	12,751,052
Senior Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	889,375	372,500
Operating Partnership Senior Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	2,083,000	2,091,375
MGM China Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt, Gross	2,163,460	2,301,584
Less: Current portion of long-term debt, net	(259,000)	(158,000)
8.625% senior notes, due 2019 [Member]
Debt Instrument [Line Items]
Senior notes	850,000	850,000
Less: Current portion of long-term debt, net	(281,000)
5.25% senior notes, due 2020 [Member]
Debt Instrument [Line Items]
Senior notes	500,000	500,000
6.75% senior notes, due 2020 [Member]
Debt Instrument [Line Items]
Senior notes	1,000,000	1,000,000
6.625% senior notes, due 2021 [Member]
Debt Instrument [Line Items]
Senior notes	1,250,000	1,250,000
7.75% senior notes, due 2022 [Member]
Debt Instrument [Line Items]
Senior notes	1,000,000	1,000,000
6% senior notes, due 2023 [Member]
Debt Instrument [Line Items]
Senior notes	1,250,000	1,250,000
5.625% Operating Partnership senior notes, due 2024 [Member]
Debt Instrument [Line Items]
Senior notes	1,050,000	1,050,000
4.625% senior notes, due 2026 [Member]
Debt Instrument [Line Items]
Senior notes	500,000	500,000
4.50% Operating Partnership senior notes, due 2026 [Member]
Debt Instrument [Line Items]
Senior notes	500,000	500,000
4.50% Operating Partnership senior notes, due 2028 [Member]
Debt Instrument [Line Items]
Senior notes	350,000	350,000
7% debentures, due 2036 [Member]
Debt Instrument [Line Items]
Senior notes	552	552
6.7% debentures, due 2096 [Member]
Debt Instrument [Line Items]
Senior notes	$ 0	$ 2,265

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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