MGM Resorts International (MGM) 10-Q 8 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	5-May-15
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	MGM
Entity Registrant Name	MGM Resorts International
Entity Central Index Key	789570
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		563,042,468

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets
Cash and cash equivalents	$2,195,535	$1,713,715
Cash deposits - original maturities longer than 90 days		570,000
Accounts receivable, net	461,751	473,345
Inventories	103,286	104,011
Income tax receivable	7,725	14,675
Prepaid expenses and other	188,310	151,414
Total current assets	2,956,607	3,027,160
Property and equipment, net	14,561,951	14,441,542
Other assets
Investments in and advances to unconsolidated affiliates	1,661,444	1,559,034
Goodwill	2,898,127	2,897,110
Other intangible assets, net	4,309,206	4,364,856
Other long-term assets, net	411,112	412,809
Total other assets	9,279,889	9,233,809
Total assets	26,798,447	26,702,511
Current liabilities
Accounts payable	187,325	164,252
Construction payable	125,720	170,439
Deferred income taxes, net	70,552	62,142
Current portion of long-term debt		1,245,320
Accrued interest on long-term debt	184,205	191,155
Other accrued liabilities	1,327,959	1,574,617
Total current liabilities	1,895,761	3,407,925
Deferred income taxes, net	2,547,150	2,621,860
Long-term debt	14,551,810	12,913,882
Other long-term obligations	150,691	130,570
Commitments and contingencies (Note 6)
Stockholders' equity
Common stock, $.01 par value: authorized 1,000,000,000 shares, issued and outstanding 491,335,813 and 491,292,117 shares	4,913	4,913
Capital in excess of par value	4,192,684	4,180,922
Retained earnings (accumulated deficit)	61,941	-107,909
Accumulated other comprehensive income	13,580	12,991
Total MGM Resorts International stockholders' equity	4,273,118	4,090,917
Noncontrolling interests	3,379,917	3,537,357
Total stockholders' equity	7,653,035	7,628,274
Total liabilities and stockholders' equity	$26,798,447	$26,702,511

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, authorized shares	1,000,000,000	1,000,000,000
Common stock, issued shares	491,335,813	491,292,117
Common stock, outstanding shares	491,335,813	491,292,117

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues
Casino	$1,278,502	$1,583,432
Rooms	459,425	452,386
Food and beverage	384,101	383,392
Entertainment	125,968	133,777
Retail	45,037	44,616
Other	126,550	125,427
Reimbursed costs	101,060	94,975
Total revenues, gross	2,520,643	2,818,005
Less: Promotional allowances	-188,399	-187,607
Total revenues, net	2,332,244	2,630,398
Expenses
Casino	782,808	990,834
Rooms	141,313	134,238
Food and beverage	221,521	220,058
Entertainment	96,999	98,937
Retail	24,096	23,476
Other	84,323	87,577
Reimbursed costs	101,060	94,975
General and administrative	328,173	319,246
Corporate expense	50,356	53,351
Preopening and start-up expenses	15,871	5,636
Property transactions, net	1,589	558
Depreciation and amortization	206,412	207,655
Total expenses	2,054,521	2,236,541
Income from unconsolidated affiliates	117,381	22,615
Operating income	395,104	416,472
Non-operating income (expense)
Interest expense, net of amounts capitalized	-216,262	-209,387
Non-operating items from unconsolidated affiliates	-19,011	-22,215
Other, net	-3,490	-1,434
Total non-operating income (expense)	-238,763	-233,036
Income before income taxes	156,341	183,436
Benefit for income taxes	56,305	2,664
Net income	212,646	186,100
Less: Net income attributable to noncontrolling interests	-42,796	-83,448
Net income attributable to MGM Resorts International	$169,850	$102,652
Net income per share of common stock attributable to MGM Resorts International
Basic	$0.35	$0.21
Diluted	$0.33	$0.20

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement Of Income And Comprehensive Income [Abstract]
Net income	$212,646	$186,100
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	2,476	-2,760
Other	-672	1,250
Other comprehensive income (loss)	1,804	-1,510
Comprehensive income	214,450	184,590
Less: Comprehensive income attributable to noncontrolling interests	-44,011	-82,205
Comprehensive income attributable to MGM Resorts International	$170,439	$102,385

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net income	$212,646	$186,100
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	206,412	207,655
Amortization of debt discounts, premiums and issuance costs	9,782	9,402
Provision for doubtful accounts	17,955	9,834
Stock-based compensation	10,676	8,195
Property transactions, net	1,589	558
Income from unconsolidated affiliates	-97,697	-381
Distributions from unconsolidated affiliates	4,039	3,703
Deferred income taxes	-68,648	-6,782
Change in operating assets and liabilities:
Accounts receivable	-6,350	-14,186
Inventories	731	6,349
Income taxes receivable and payable, net	6,879	5,736
Prepaid expenses and other	-37,386	-29,736
Prepaid Cotai land concession premium	-12,953	-12,945
Accounts payable and accrued liabilities	-77,428	-87,934
Other	5,401	5,227
Net cash provided by operating activities	175,648	290,795
Cash flows from investing activities
Capital expenditures, net of construction payable	-292,329	-192,751
Dispositions of property and equipment	164	135
Investments in and advances to unconsolidated affiliates	-160,079	-32,175
Distributions from unconsolidated affiliates in excess of earnings	1,111	497
Investments in treasury securities - maturities longer than 90 days		-54,064
Proceeds from treasury securities - maturities longer than 90 days		63,063
Cash deposits - original maturities longer than 90 days	570,000
Other	-2,070	1,226
Net cash provided by (used in) investing activities	116,797	-214,069
Cash flows from financing activities
Net repayments under bank credit facilities b maturities of 90 days or less	-1,318,626	-1,735,125
Borrowings under bank credit facilities b maturities longer than 90 days	1,710,625	1,728,125
Retirement of senior notes		-508,900
Distributions to noncontrolling interest owners	-202,624	-247,140
Other	-152	-1,648
Net cash provided by (used in) financing activities	189,223	-764,688
Effect of exchange rate on cash	704	-971
Cash and cash equivalents
Net increase (decrease) for the period	482,372	-688,933
Change in cash related to assets held for sale	-552
Balance, beginning of period	1,713,715	1,803,669
Balance, end of period	2,195,535	1,114,736
Supplemental cash flow disclosures
Interest paid, net of amounts capitalized	213,430	200,226
Federal, state and foreign income taxes paid, net of refunds	4,747	3,864
Non-cash investing and financing activities
Increase (decrease) in investment in and advances to CityCenter related to change in completion guarantee liability	($8,198)	$12,306

Organization

Organization	3 Months Ended
	Mar. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization	NOTE 1 — ORGANIZATION
	Organization. MGM Resorts International (the “Company”) is a Delaware corporation that acts largely as a holding company and, through wholly owned subsidiaries, owns and/or operates casino resorts. The Company owns and operates the following casino resorts in Las Vegas, Nevada: Bellagio, MGM Grand Las Vegas, The Mirage, Mandalay Bay, Luxor, New York-New York, Monte Carlo, Excalibur and Circus Circus Las Vegas. Operations at MGM Grand Las Vegas include management of The Signature at MGM Grand Las Vegas, a condominium-hotel consisting of three towers. The Company owns and operates Circus Circus Reno in Reno, Nevada. In April 2015, the Company sold Railroad Pass in Henderson, Nevada and Gold Strike in Jean, Nevada, as discussed in Note 3. Along with local investors, the Company owns and operates MGM Grand Detroit in Detroit, Michigan. The Company owns and operates two resorts in Mississippi: Beau Rivage in Biloxi and Gold Strike Tunica. The Company also owns Shadow Creek, an exclusive world-class golf course located approximately ten miles north of its Las Vegas Strip resorts, Primm Valley Golf Club at the California/Nevada state line and Fallen Oak golf course in Saucier, Mississippi.
	The Company owns 51% and has a controlling interest in MGM China Holdings Limited (“MGM China”), which owns MGM Grand Paradise, S.A. (“MGM Grand Paradise”), the Macau company that owns and operates the MGM Macau resort and casino and the related gaming subconcession and land concession. MGM Grand Paradise also has a land concession contract with the government of Macau to develop a second resort and casino on an approximately 18 acre site in Cotai, Macau (“MGM Cotai”). MGM Cotai will be an integrated casino, hotel and entertainment resort and is currently expected to have approximately 1,500 hotel rooms, 500 gaming tables and 1,500 slots. The total estimated project budget is $3.0 billion, excluding development fees eliminated in consolidation, capitalized interest and land related costs.
	The Company owns 50% of CityCenter, located between Bellagio and Monte Carlo. The other 50% of CityCenter is owned by Infinity World Development Corp, a wholly owned subsidiary of Dubai World, a Dubai, United Arab Emirates government decree entity. CityCenter consists of Aria, a casino resort; Mandarin Oriental Las Vegas, a non-gaming boutique hotel; Crystals, a retail, dining and entertainment district; and Vdara, a luxury condominium-hotel. In addition, CityCenter features residential units in the Residences at Mandarin Oriental and Veer. The Company receives a management fee of 2% of revenues for the management of Aria and Vdara, and 5% of EBITDA (as defined in the agreements governing the Company’s management of Aria and Vdara). In addition, the Company receives an annual fee of $3 million for the management of Crystals. See Notes 4 and 6 for additional information related to CityCenter.
	The Company owns 50% of the Borgata Hotel Casino & Spa (“Borgata”) located on Renaissance Pointe in the Marina area of Atlantic City, New Jersey. Boyd Gaming Corporation owns the other 50% of Borgata and also operates the resort.  See Note 4 for additional information regarding Borgata.  The Company also has 50% interests in Grand Victoria and Silver Legacy. Grand Victoria is a riverboat casino in Elgin, Illinois; an affiliate of Hyatt Gaming owns the other 50% of Grand Victoria and also operates the resort. Silver Legacy is located in Reno, adjacent to Circus Circus Reno, and the other 50% is owned by Eldorado Resorts, Inc.
	The Company has entered into management agreements for future non-gaming hotels, resorts and residential products in the Middle East, North Africa, India and the United States. In 2014, the Company and the Hakkasan Group formed MGM Hakkasan Hospitality (“MGM Hakkasan”), owned 50% by each member, to design, develop and manage luxury non-gaming hotels, resorts and residences under certain brands licensed from the Company and the Hakkasan Group. In October 2014, the Company contributed all of the management agreements for non-gaming hotels, resorts and residential projects (outside of the greater China region) that are currently under development to MGM Hakkasan. The Company will continue to develop and manage properties in the greater China region with Diaoyutai State Guesthouse, including MGM Grand Sanya.
	The Maryland Video Lottery Facility Location Commission has awarded the Company’s subsidiary developing MGM National Harbor the license to build and operate a destination resort casino in Prince George’s County at National Harbor. The expected cost to develop and construct MGM National Harbor is approximately $1.3 billion, excluding capitalized interest and land related costs. The Company expects the resort to include a casino with approximately 3,600 slots and 160 table games including poker; a 300-room hotel with luxury spa and rooftop pool; 79,000 square feet of high‑end branded retail and fine and casual dining; a 3,000-seat theater venue; 50,000 square feet of meeting and event space; and a 4,700-space parking garage.
	The Company’s subsidiary that will develop MGM Springfield was awarded the Category One casino license in Region B, Western Massachusetts, one of three licensing regions designated by legislation, to build and operate MGM Springfield. MGM Springfield will be developed on 14.5 acres of land in downtown Springfield, Massachusetts. The expected cost to develop and construct MGM Springfield is $760 million, excluding capitalized interest and land related costs. The Company expects the resort will include a casino with approximately 3,000 slots and 100 table games including poker; a 250-room hotel; 64,000 square feet of retail and restaurant space; 33,000 square feet of meeting and event space; and a 3,500-space parking garage.
	In 2013, the Company formed Las Vegas Arena Company, LLC (the “Las Vegas Arena Company”) with a subsidiary of Anschutz Entertainment Group, Inc. (“AEG”) - a leader in sports, entertainment, and promotions - to design, construct, and operate the Las Vegas Arena, which will be located on a parcel of the Company’s land between Frank Sinatra Drive and New York-New York, adjacent to the Las Vegas Strip. The Company and AEG each own 50% of Las Vegas Arena Company. The Las Vegas Arena is anticipated to seat between 18,000 – 20,000 people. Such development is estimated to cost approximately $350 million, excluding capitalized interest and land related costs.
	The Company has two reportable segments: wholly owned domestic resorts and MGM China. See Note 10 for additional information about the Company’s segments.

Basis_of_Presentation_and_Sign

Basis of Presentation and Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	NOTE 2 — BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES
	Basis of presentation. As permitted by the rules and regulations of the Securities and Exchange Commission, certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted. These consolidated financial statements should be read in conjunction with the Company’s 2014 annual consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.
	In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments, which include only normal recurring adjustments, necessary to present fairly the Company’s interim financial statements. The results for such periods are not necessarily indicative of the results to be expected for the full year.
	The consolidated financial statements have been retroactively adjusted to reflect the Company’s investment in Borgata under the equity method for all periods presented in this quarterly report. The impact of the retroactive adjustments on net income for the three months ended March 31, 2014 was a decrease of $6 million.
	Fair value measurements. Fair value measurements affect the Company’s accounting and impairment assessments of its long-lived assets, investments in unconsolidated affiliates, cost method investments, assets acquired and liabilities assumed in an acquisition, and goodwill and other intangible assets. Fair value measurements also affect the Company’s accounting for certain of its financial assets and liabilities. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date and is measured according to a hierarchy that includes: Level 1 inputs, such as quoted prices in an active market; Level 2 inputs, which are observable inputs for similar assets; or Level 3 inputs, which are unobservable inputs. The Company uses Level 1 inputs for its long-term debt fair value disclosures. See Note 5.
	Property and equipment. As of March 31, 2015, the Company had accrued $8 million for property and equipment within “Accounts payable” and $28 million related to construction retention in “Other long-term obligations.” In addition, during the three months ended March 31, 2015, the Company entered into capital leases with obligations of $16 million.
	Income tax provision. For interim income tax reporting the Company estimates its annual effective tax rate and applies it to its year-to-date ordinary income. The tax effects of unusual or infrequently occurring items, including changes in judgment about valuation allowances and effects of changes in tax laws or rates, are reported in the interim period in which they occur. The Company’s effective income tax rate was (36%) for the three months ended March 31, 2015.
	The Company recognizes deferred tax assets, net of applicable reserves, related to tax loss and credit carryforwards and other temporary differences with a future tax benefit to the extent that realization of such benefit is more likely than not. Otherwise, a valuation allowance is applied. As of December 31, 2014, the scheduled future reversal of existing U.S. federal taxable temporary differences exceeds the scheduled future reversal of existing U.S. federal deductible temporary differences.  Consequently, the Company no longer applies a valuation allowance against its domestic deferred tax assets other than its foreign tax credit deferred tax asset.
	The Company generates significant excess foreign tax credits each year that are attributable to the Macau Special Gaming Tax which is 35% of gross gaming revenue in Macau.  Because MGM China is presently exempt from the Macau 12% complementary tax on gaming profits, the Company believes that payment of the Macau Special Gaming Tax qualifies as a tax paid in lieu of an income tax that is creditable against U.S. taxes. As long as the exemption from Macau’s 12% complementary tax on gaming profits continues, the Company expects that it will generate excess foreign tax credits on an annual basis and that none of the excess foreign credits will be utilized until the exemption expires. Although the Company’s current five-year exemption from the Macau 12% complementary tax on gaming profits ends on December 31, 2016, the Company believes it will be entitled to receive a third five-year exemption from Macau based upon exemptions granted to the Company’s competitors in order to ensure non-discriminatory treatment among gaming concessionaires and subconcessionaires. For all periods beyond December 31, 2021, the Company has assumed that it will be paying the Macau 12% complementary tax on gaming profits and will thus not be able to credit the Macau Special Gaming Tax in such years, and has factored that assumption into its assessment of the realization of the foreign tax credit deferred tax asset.  Furthermore, the Company does not rely on future U.S. source operating income in assessing future foreign tax credit realization due to its history of recent losses in the U.S. and therefore only relies on U.S. federal taxable temporary differences that it expects will reverse during the 10-year foreign tax credit carryover period.
	The Company projects that it will be able to realize a benefit and, hence, projects that it will record a deferred tax asset for foreign tax credits, net of valuation allowance, of approximately $252 million as of December 31, 2015 and has reflected this assumption in its annual effective tax rate for 2015. The Company’s assessment of realization of its foreign tax credit deferred tax asset is based on available evidence, including assumptions about future profitability of and distributions from MGM China, as well as its assumption concerning renewals of the five-year exemption from Macau’s 12% complementary tax on gaming profits.  As a result, significant judgment is required in assessing the possible need for a valuation allowance and changes to such assumptions may have a material impact on the amount of the valuation allowance.  For example, should the Company in a future period actually receive or be able to assume an additional five-year exemption, an additional valuation allowance would likely need to be provided on some portion or all of the foreign tax credit deferred tax asset, resulting in an increase in the provision for income taxes in such period and such increase may be material.  In addition, a change to forecasts of future profitability of, and distributions from, MGM China could also result in a material change in the valuation allowance with a corresponding impact on the provision for income taxes in such period.
	Recently issued accounting standards. In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers,” (“ASU 2014-09”), which is effective for fiscal years, and interim periods within those years, beginning on or after December 15, 2016. ASU 2014-09 outlines a new, single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. This new revenue recognition model provides a five-step analysis in determining when and how revenue is recognized. Additionally, the new model will require revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration a company expects to receive in exchange for those goods or services. The Company is currently assessing the impact that adoption of ASU 2014-09 will have on its consolidated financial statements and footnote disclosures.
	In February 2015, the FASB issued Accounting Standards Update No. 2015-02, “Amendments to the Consolidation Analysis,” (“ASU 2015-02”), which is effective for fiscal years, and interim periods within those years, beginning after December 15, 2015.  ASU 2015-02 amends: the assessment of whether a limited partnership is a variable interest entity; the effect that fees paid to a decision maker have on the consolidation analysis; how variable interests held by a reporting entity’s related parties or de facto agents affect its consolidation conclusion; and for entities other than limited partnerships, clarifies how to determine whether the equity holders as a group have power over an entity. The Company is currently assessing the impact that adoption of ASU 2015-02 will have on its consolidated financial statements and footnote disclosures.

Assets_Held_For_Sale

Assets Held For Sale	3 Months Ended
	Mar. 31, 2015
Property Plant And Equipment Assets Held For Sale Disclosure [Abstract]
Assets Held for Sale	NOTE 3 — ASSETS HELD FOR SALE
	On April 1, 2015, the Company closed the sale of Railroad Pass.  At closing, the Company received $8 million in cash proceeds. The assets and liabilities of Railroad Pass have been classified as held for sale as of March 31, 2015 and December 31, 2014. At March 31, 2015 and December 31, 2014, assets held for sale of $10 million and $9 million, respectively, comprised predominantly of property and equipment, are classified within “Prepaid expenses and other” and liabilities related to assets held for sale of $1 million and $2 million, respectively, comprised of accounts payable and other accrued liabilities, are classified within “Other accrued liabilities.”
	On April 30, 2015, the Company closed the sale of Gold Strike and related assets in Jean, Nevada. At closing, the Company received $12 million in cash proceeds. The assets and liabilities of Gold Strike have been classified as held for sale as of March 31, 2015 and December 31, 2014.  Assets held for sale of $14 million, comprised predominantly of property and equipment, are classified within “Prepaid expenses and other” at both March 31, 2015 and December 31, 2014.  Liabilities related to assets held for sale of $2 million, comprised of accounts payable and other accrued liabilities, are classified within “Other accrued liabilities” at both March 31, 2015 and December 31, 2014.
	Railroad Pass and Gold Strike have not been classified as discontinued operations because the Company has concluded that the sales will not have a major effect on the Company’s operations or its financial results and it does not represent a disposal of a major geographic segment or product line.

Investments_in_and_Advances_to

Investments in and Advances to Unconsolidated Affiliates	3 Months Ended
	Mar. 31, 2015
Equity Method Investments And Joint Ventures [Abstract]
Investments in and Advances to Unconsolidated Affiliates	NOTE 4 — INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES
	Investments in and advances to unconsolidated affiliates consisted of the following:
		March 31,			December 31,
		2015			2014
		(In thousands)
	CityCenter Holdings, LLC – CityCenter (50%)	$	1,305,707		$	1,221,306
	Elgin Riverboat Resort–Riverboat Casino – Grand Victoria (50%)		140,052			141,162
	Marina District Development Company – Borgata (50%)		112,333			109,252
	Other		103,352			87,314
		$	1,661,444		$	1,559,034
	The Company recorded its share of the results of operations of unconsolidated affiliates as follows:
		Three Months Ended
		March 31,
		2015			2014
		(In thousands)
	Income from unconsolidated affiliates	$	117,381		$	22,615
	Preopening and start-up expenses		(673	)		(19	)
	Non-operating items from unconsolidated affiliates		(19,011	)		(22,215	)
		$	97,697		$	381
	CityCenter
	Summarized balance sheet information for CityCenter is as follows:
		March 31,			December 31,
		2015			2014
		(In thousands)
	Current assets	$	666,600		$	561,904
	Property and other assets, net		7,830,931			7,883,709
	Current liabilities		255,659			508,168
	Long-term debt and other long-term obligations		1,553,008			1,552,913
	Equity		6,688,864			6,384,532
	Summarized income statement information for CityCenter is as follows:
		Three Months Ended
		March 31,
		2015			2014
		(In thousands)
	Net revenues	$	318,239		$	336,417
	Operating expenses		(136,633	)		(331,454	)
	Operating income		181,606			4,963
	Non-operating expenses		(18,005	)		(25,165	)
	Net income (loss)	$	163,601		$	(20,202	)
	CityCenter litigation settlement. In December 2014, the Company and CityCenter entered into a settlement agreement with Perini Building Company, Inc. (“Perini”), general contractor for CityCenter, the remaining Perini subcontractors and relevant insurers to resolve all outstanding project lien claims and CityCenter’s counterclaims relating to the Harmon Hotel and Spa. The settlement was subject to execution of a global settlement agreement among the parties described above, which was subsequently executed, and CityCenter’s procurement of replacement general liability insurance covering construction of the CityCenter development, which was obtained in January 2015. The proceeds pursuant to such global settlement agreement, combined with certain prior Harmon-related insurance settlement proceeds, resulted in a gain of $160 million recorded by CityCenter during the first quarter of 2015, of which the Company recorded its 50% share of $80 million.
	CityCenter dividend. In April 2015, CityCenter adopted an annual distribution policy and declared a special dividend of $400 million, of which the Company received its 50% share of $200 million. Under the annual distribution policy, CityCenter will distribute up to 35% of excess cash flow, subject to the approval of the CityCenter board of directors.
	Las Vegas Arena
	See Note 6 for discussion of the Company’s joint and several completion and repayment guarantees and equity contribution commitments related to the Las Vegas Arena.

LongTerm_Debt

Long-Term Debt	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Long-Term Debt	NOTE 5 — LONG-TERM DEBT
	Long-term debt consisted of the following:
		March 31,		December 31,
		2015		2014
		(In thousands)
	Senior credit facility:
	$2,737 million ($2,744 million at December 31, 2014) term loans, net	$	2,731,392	$	2,738,118
	MGM Grand Paradise credit facility:
	$550 million term loans		553,376		553,177
	Revolving loans		399,876		—
	$1,450 million 4.25% convertible senior notes, due 2015, net		1,450,201		1,451,405
	$875 million 6.625% senior notes, due 2015, net		875,200		875,370
	$242.9 million 6.875% senior notes, due 2016		242,900		242,900
	$732.7 million 7.5% senior notes, due 2016		732,749		732,749
	$500 million 10% senior notes, due 2016, net		498,212		497,955
	$743 million 7.625% senior notes, due 2017		743,000		743,000
	$475 million 11.375% senior notes, due 2018, net		469,347		468,949
	$850 million 8.625% senior notes, due 2019		850,000		850,000
	$500 million 5.25% senior notes, due 2020		500,000		500,000
	$1,000 million 6.75% senior notes, due 2020		1,000,000		1,000,000
	$1,250 million 6.625% senior notes, due 2021		1,250,000		1,250,000
	$1,000 million 7.75% senior notes, due 2022		1,000,000		1,000,000
	$1,250 million 6% senior notes, due 2023, net		1,250,720		1,250,742
	$0.6 million 7% debentures, due 2036, net		572		572
	$4.3 million 6.7% debentures, due 2096		4,265		4,265
			14,551,810		14,159,202
	Less: Current portion		—		(1,245,320	)
		$	14,551,810	$	12,913,882
	Debt due within one year of the March 31, 2015 balance sheet date was classified as long-term as substantially all of the $1.45 billion 4.25% convertible senior notes were converted into shares of the Company’s common stock in April 2015, and the Company has both the intent and ability to refinance other current maturities on a long-term basis under its revolving senior credit facility.  As of December 31, 2014, the amount available under the Company’s revolving senior credit facility was less than current maturities related to the Company’s senior notes, convertible senior notes and term loan credit facilities. The Company excluded from the December 31, 2014 current portion of long-term debt the amount available for refinancing under its revolving credit facility.
	Senior credit facility. At March 31, 2015, the Company’s senior credit facility consisted of a $1.2 billion revolving credit facility, a $1.03 billion term loan A facility and a $1.71 billion term loan B facility. The revolving and term loan A facilities bear interest at LIBOR plus an applicable rate determined by the Company’s credit rating (2.75% as of March 31, 2015). The term loan B facility bears interest at LIBOR plus 2.50%, with a LIBOR floor of 1.00%. The revolving and term loan A facilities mature in December 2017 and the term loan B facility matures in December 2019. The term loan A and term loan B facilities are subject to scheduled amortization payments on the last day of each calendar quarter in an amount equal to 0.25% of the original principal balance. The Company permanently repaid $7 million in 2015 in accordance with the scheduled amortization. The Company had $1.1 billion of available borrowing capacity under its senior credit facility at March 31, 2015. At March 31, 2015, the interest rate on the term loan A was 2.9% and the interest rate on the term loan B was 3.5%.
	The land and substantially all of the assets of MGM Grand Las Vegas, Bellagio and The Mirage secure up to $3.35 billion of obligations outstanding under the senior credit facility. In addition, the land and substantially all of the assets of New York-New York and Gold Strike Tunica secure the entire amount of the senior credit facility and the land and substantially all of the assets of MGM Grand Detroit secure its $450 million of obligations as a co-borrower under the senior credit facility. In addition, the senior credit facility is secured by a pledge of the equity or limited liability company interests of the subsidiaries that own the pledged properties.
	The senior credit facility contains customary representations and warranties and customary affirmative and negative covenants. In addition, the senior credit facility requires the Company and its restricted subsidiaries (the “Restricted Group”) to maintain a minimum trailing four-quarter EBITDA (as defined in the senior credit facility) and limits the ability of the Restricted Group to make capital expenditures and investments. As of March 31, 2015, the Restricted Group was required to maintain a minimum EBITDA of $1.25 billion. The minimum EBITDA requirement is $1.25 billion through June 30, 2015 and increases to $1.30 billion for September 30, 2015 and December 31, 2015 and to $1.35 billion for March 31, 2016, with periodic increases thereafter. EBITDA for the trailing four quarters ended March 31, 2015, calculated in accordance with the terms of the senior credit facility, was $1.35 billion. The senior credit facility limits the Restricted Group to capital expenditures of $500 million per fiscal year, with unused amounts in any fiscal year rolling over to the next fiscal year, but not any fiscal year thereafter. The Restricted Group’s total capital expenditures allowable under the senior credit facility for fiscal year 2015, after giving effect to unused amounts from 2014, was $794 million. In addition, the senior credit facility limits the Restricted Group’s ability to make investments subject to certain thresholds and other important exceptions. As of March 31, 2015, the Restricted Group was within the limit of capital expenditures and other investments for the 2015 calendar year.
	The senior credit facility provides for customary events of default, including, without limitation, (i) payment defaults, (ii) covenant defaults, (iii) cross-defaults to certain other indebtedness in excess of specified amounts, (iv) certain events of bankruptcy and insolvency, (v) judgment defaults in excess of specified amounts, (vi) the failure of any loan document by a significant party to be in full force and effect and such circumstance, in the reasonable judgment of the required lenders, is materially adverse to the lenders, or (vii) the security documents cease to create a valid and perfected first priority lien on any material portion of the collateral. In addition, the senior credit facility provides that a cessation of business due to revocation, suspension or loss of any gaming license affecting a specified amount of its revenues or assets, will constitute an event of default.
	MGM Grand Paradise credit facility. At March 31, 2015, the MGM Grand Paradise credit facility consisted of approximately $550 million of term loans and an approximately $1.45 billion revolving credit facility due October 2017. The credit facility is subject to scheduled amortization payments beginning in July 2016. The interest rate on the facility fluctuates annually based on HIBOR plus a margin, which ranges between 1.75% and 2.50%, based on MGM China’s leverage ratio. The margin was 1.75% at March 31, 2015. MGM China is a joint and several co-borrower with MGM Grand Paradise. The MGM Grand Paradise credit facility is secured by MGM Grand Paradise’s interest in the Cotai land use right, and MGM China, MGM Grand Paradise and their guarantor subsidiaries have granted a security interest in substantially all of their assets to secure the facility. The MGM Grand Paradise credit facility will be used for general corporate purposes and for the development of MGM Cotai. At March 31, 2015, the interest rate on the term loans and outstanding revolving loans was 1.99%.
	The MGM Grand Paradise credit facility agreement contains customary representations and warranties, events of default, affirmative covenants and negative covenants, which impose restrictions on, among other things, the ability of MGM China and its subsidiaries to make investments, pay dividends and sell assets, and to incur additional debt and additional liens. MGM China is also required to maintain compliance with a maximum consolidated total leverage ratio of 4.50 to 1.00 prior to the first anniversary of the MGM Cotai opening date and 4.00 to 1.00 thereafter, in addition to a minimum interest coverage ratio of 2.50 to 1.00. MGM China was in compliance with its credit facility covenants at March 31, 2015.
	In April 2015, MGM China agreed in principle with its lenders to amend and restate its senior credit facility and increase the term loan commitments to $1.55 billion and extend the maturity date for the term loans and the revolving credit facility to April 2019. Additionally, the amended MGM Grand Paradise credit facility is expected to bear interest at a fluctuating rate per annum based on HIBOR plus a margin, initially set for a six month period at 1.75% per annum, but thereafter will range between 1.375% and 2.50% based on MGM China’s leverage ratio. The consent is subject to the execution of a formal amended and restated facilities agreement, among the lenders, MGM China and MGM Grand Paradise and is conditioned upon the satisfaction (or waiver) of all conditions precedent to its effectiveness, including, but not limited to, receipt of any government or regulatory approval required in connection with the transaction. There is no assurance as to whether and when binding agreements in respect of the proposed facilities will be finalized.
	Convertible senior notes. In April 2015, holders of substantially all of the $1.45 billion in aggregate principle amount of 4.25% convertible senior notes elected to convert the notes into approximately 78 million shares of the Company’s common stock.  The notes were converted at 53.83 shares of common stock per $1,000 principle amount, which is equivalent to a conversion price of approximately $18.58 per share.  In addition, the Company settled the capped call transactions entered into in connection with the initial issuance of $1.15 billion aggregate principle amount of notes and received approximately 6 million shares from such financial institutions. Such shares received in connection with the capped call transactions were subsequently retired.
	Fair value of long-term debt. The estimated fair value of the Company’s long-term debt at March 31, 2015 was $15.4 billion. At December 31, 2014, the estimated fair value of the Company’s long-term debt was $15.1 billion. Fair value was estimated using quoted market prices for the Company’s senior notes and senior credit facility. Carrying value of the MGM Grand Paradise credit facility approximates fair value.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 6 — COMMITMENTS AND CONTINGENCIES
	CityCenter completion guarantee. In October 2013, the Company entered into a third amended and restated completion and cost overrun guarantee, which is collateralized by substantially all of the assets of Circus Circus Las Vegas, as well as certain land adjacent to that property. As of March 31, 2015, the Company had funded $888 million under the completion guarantee. During the first quarter of 2015, the Company fulfilled its remaining significant obligations under the completion guarantee in conjunction with the resolution of the Perini litigation and related settlement agreements. The Company is in the process of seeking termination of the completion guarantee and the release of the assets securing such completion guarantee with CityCenter’s lenders.
	Cotai land concession contract. MGM Grand Paradise’s land concession contract for an approximate 18 acre site on the Cotai Strip in Macau became effective on January 9, 2013 and has an initial term of 25 years. The total land premium payable to the Macau government for the land concession contract is $161 million and is composed of a down payment and eight additional semi-annual payments. As of March 31, 2015, MGM China had paid $115 million of the contract premium, including interest due on the semi-annual payments, and the amount paid is recorded within “Other long-term assets, net.” Including interest on the four remaining semi-annual payments, MGM China has approximately $59 million remaining payable for the land concession contract. Under the terms of the land concession contract, MGM Grand Paradise is required to complete the development of the land by January 2018.
	Las Vegas Arena. In conjunction with Las Vegas Arena Company entering a senior secured credit facility in 2014, the Company and AEG each entered joint and several completion guarantees for the project, as well as a repayment guarantee for the $75 million term loan B (subject to increases and decreases in the event of a rebalancing of the principal amount of indebtedness between the term loan A and term loan B facilities). Additionally, in conjunction with the Las Vegas Arena Company’s senior secured credit facility, the Company and AEG have pledged to contribute equal amounts totaling $175 million for construction, of which $113 million has been contributed as of March 31, 2015.
	Other guarantees. The Company is party to various guarantee contracts in the normal course of business, which are generally supported by letters of credit issued by financial institutions. The Company’s senior credit facility limits the amount of letters of credit that can be issued to $500 million, and the amount of available borrowings under the senior credit facility is reduced by any outstanding letters of credit.  At March 31, 2015, the Company had provided $52 million of letters of credit. MGM Grand Paradise’s senior credit facility limits the amount of letters of credit that can be issued to $100 million, and the amount of available borrowings under the senior credit facility is reduced by any outstanding letters of credit.  At March 31, 2015, MGM China had provided approximately $39 million of guarantees under its credit facility.
	In connection with the development of MGM Springfield as discussed in Note 1, the Company obtained a surety bond of $52 million naming the Commonwealth of Massachusetts as beneficiary, and payable thereto, in the event that the Company’s subsidiary is unable to complete the gaming establishment.
	Other litigation. The Company is a party to various legal proceedings, most of which relate to routine matters incidental to its business.  Management does not believe that the outcome of such proceedings will have a material adverse effect on the Company’s financial position, results of operations or cash flows.

Income_Loss_Per_Share_of_Commo

Income (Loss) Per Share of Common Stock	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Income Per Share of Common Stock	NOTE 7 — INCOME PER SHARE OF COMMON STOCK
	The weighted-average number of common and common equivalent shares used in the calculation of basic and diluted income per share consisted of the following:
		Three Months Ended
		March 31,
		2015			2014
		(In thousands)
	Numerator:
	Net income attributable to MGM Resorts International - basic	$	169,850		$	102,652
	Interest on convertible debt, net of tax		19,967			2,195
	Potentially dilutive effect due to MGM China Share Option Plan		(8	)		(132	)
	Net income attributable to MGM Resorts International - diluted	$	189,809		$	104,715
	Denominator:
	Weighted-average common shares outstanding - basic		491,422			490,542
	Potential dilution from share-based awards		5,836			6,453
	Potential dilution from assumed conversion of convertible debt		78,054			16,149
	Weighted-average common and common equivalent shares - diluted		575,312			513,144
	Antidilutive share-based awards excluded from the calculation of diluted		4,627			2,625
	earnings per share
	Potential dilution from the assumed conversion of convertible debt for the three months ended March 31, 2015 does not take into consideration the 6 million shares received pursuant to the capped call transactions as discussed in Note 5, as the effect would be antidilutive. For the three months ended March 31, 2014, potential dilution from the assumed conversion of convertible debt relates to the $300 million 4.25% senior convertible notes issued in June 2011. The $1.15 billion 4.25% senior convertible notes issued in April 2010 were excluded from the March 31, 2014 calculation of diluted earnings per share as their effect would be antidilutive.

Stockholders_Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Stockholders' Equity	NOTE 8 — STOCKHOLDERS’ EQUITY
	MGM China dividends. MGM China paid a $400 million special dividend in March 2015, of which $204 million remained within the consolidated entity and $196 million was distributed to noncontrolling interests. Additionally, in February 2015, MGM China’s Board of Directors recommended a final dividend for 2014 of approximately $120 million, subject to approval at MGM China’s 2015 annual shareholder meeting.
	MGM China paid a $499 million special dividend in March 2014, of which $254 million remained within the consolidated entity and $245 million was distributed to noncontrolling interests.
	Supplemental equity information. The following table presents the Company’s changes in stockholders’ equity for the three months ended March 31, 2015:
		MGM Resorts
		International						Total
		Stockholders'			Noncontrolling			Stockholders'
		Equity			Interests			Equity
		(In thousands)
	Balances, January 1, 2015	$	4,090,917		$	3,537,357		$	7,628,274
	Net income		169,850			42,796			212,646
	Currency translation adjustment		1,261			1,215			2,476
	Other comprehensive loss from unconsolidated affiliate, net		(672	)		—			(672	)
	Stock-based compensation		9,350			1,352			10,702
	Change in excess tax benefit from stock-based compensation		(2,166	)		—			(2,166	)
	Issuance of common stock pursuant to stock-based compensation awards		(294	)		—			(294	)
	Cash distributions to noncontrolling interest owners		—			(202,803	)		(202,803	)
	Issuance of performance share units		4,872			—			4,872
	Balances, March 31, 2015	$	4,273,118		$	3,379,917		$	7,653,035
	Accumulated other comprehensive income (loss). Changes in accumulated other comprehensive income (loss) attributable to MGM Resorts International by component are as follows:
		Currency
		Translation			Other
		Adjustment			Adjustments			Total
		(In thousands)
	Balances, January 1, 2015	$	12,319		$	672		$	12,991
	Current period other comprehensive income (loss)		1,261			(672	)		589
	Balances, March 31, 2015	$	13,580		$	—		$	13,580

StockBased_Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	NOTE 9 — STOCK-BASED COMPENSATION
	2005 Omnibus Incentive Plan. As of March 31, 2015, the Company had an aggregate of 23 million shares of common stock available for grant as share-based awards under the Company’s omnibus incentive plan (“Omnibus Plan”). A summary of activity under the Company’s share-based payment plans for the three months ended March 31, 2015 is presented below:
	Stock options and stock appreciation rights (“SARs”)
		Units			Weighted Average
		(000’s)			Exercise Price
	Outstanding at January 1, 2015		16,176		$	15.27
	Granted		12			20.03
	Exercised		(163	)		14.1
	Forfeited or expired		(856	)		35.27
	Outstanding at March 31, 2015		15,169			14.2
	Exercisable at March 31, 2015		9,824			12.34
	Restricted stock units (“RSUs”) and performance share units (“PSUs”)
		RSUs						PSUs
					Weighted					Weighted		Weighted
					Average					Average		Average
		Units			Grant-Date			Units		Grant-Date		Target
		(000’s)			Fair Value			(000’s)		Fair Value		Price
	Nonvested at January 1, 2015		1,358		$	18.27			1,455	$	15.14	$	20.48
	Forfeited		(15	)		18.08			—		—		—
	Nonvested at March 31, 2015		1,343			18.27			1,455		15.14		20.48
	Bonus PSUs
		Units			Weighted Average
		(000’s)			Target Price
	Outstanding at January 1, 2015		265		$	31.72
	Granted		229			25.91
	Outstanding at March 31, 2015		494			29.03
	The Company grants PSUs for the portion of any calculated bonus for a Section 16 officer of the Company that is in excess of such officer’s base salary (the “Bonus PSU Policy”). Awards granted under the Bonus PSU Policy have the same terms as PSUs granted under the Omnibus Plan with the exception that as of the grant date the awards will not be subject to forfeiture in the event of the officer’s termination.
	MGM China Share Option Plan. As of March 31, 2015, MGM China had an aggregate of 338 million shares of common stock available for grant as share-based awards under the MGM China share option plan (“MGM China Plan”). A summary of activity under the MGM China Plan for the three months ended March 31, 2015 is presented below:
	Stock options
		Units			Weighted Average
		(000’s)			Exercise Price
	Outstanding at January 1, 2015		35,058		$	2.85
	Granted		710			2.48
	Outstanding at March 31, 2015		35,768			2.84
	Exercisable at March 31, 2015		10,642			2.05
	Recognition of compensation cost. Compensation cost for both the Omnibus Plan and MGM China Plan was recognized as follows:
		Three Months Ended
		March 31,
		2015			2014
		(In thousands)
	Compensation cost:
	Omnibus Plan	$	7,942		$	7,002
	MGM China Plan		2,760			1,461
	Total compensation cost		10,702			8,463
	Less:  Reimbursed costs and capitalized cost		(290	)		(268	)
	Compensation cost after reimbursed costs and capitalized cost		10,412			8,195
	Less:  Related tax benefit		(2,634	)		(2,317	)
	Compensation cost, net of tax benefit	$	7,778		$	5,878

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Segment Information	NOTE 10 — SEGMENT INFORMATION
	The Company’s management views each of its casino resorts as an operating segment. Operating segments are aggregated based on their similar economic characteristics, types of customers, types of services and products provided, the regulatory environments in which they operate, and their management and reporting structure. The Company’s principal operating activities occur in two geographic regions: the United States and Macau S.A.R. The Company has aggregated its operations into two reportable segments based on the similar characteristics of the operating segments within the regions in which they operate: wholly owned domestic resorts and MGM China. The Company’s operations related to investments in unconsolidated affiliates and certain other corporate operations and management services have not been identified as separate reportable segments; therefore, these operations are included in “Corporate and other, net” in the following segment disclosures to reconcile to consolidated results.
	The Company’s management utilizes Adjusted Property EBITDA as the primary profit measure for its reportable segments. Adjusted Property EBITDA is a measure defined as Adjusted EBITDA before corporate expense and stock compensation expense related to the Omnibus Plan, which are not allocated to the reportable segments. MGM China recognizes stock compensation expense related to the MGM China Plan which is included in the calculation of Adjusted EBITDA for MGM China. Adjusted EBITDA is a measure defined as earnings before interest and other non-operating income (expense), taxes, depreciation and amortization, preopening and start-up expenses and property transactions, net.
	The following tables present the Company’s segment information:
		Three Months Ended
		March 31,
		2015			2014
		(In thousands)
	Net Revenues
	Wholly owned domestic resorts	$	1,577,895		$	1,570,234
	MGM China		630,087			941,448
	Reportable segment net revenues		2,207,982			2,511,682
	Corporate and other		124,262			118,716
		$	2,332,244		$	2,630,398
	Adjusted Property EBITDA
	Wholly owned domestic resorts	$	389,879		$	402,846
	MGM China		148,456			240,725
	Reportable segment Adjusted Property EBITDA		538,335			643,571
	Other operating income (expense)
	Corporate and other, net		80,641			(13,250	)
	Preopening and start-up expenses		(15,871	)		(5,636	)
	Property transactions, net		(1,589	)		(558	)
	Depreciation and amortization		(206,412	)		(207,655	)
	Operating income		395,104			416,472
	Non-operating income (expense)
	Interest expense, net of amounts capitalized		(216,262	)		(209,387	)
	Non-operating items from unconsolidated affiliates		(19,011	)		(22,215	)
	Other, net		(3,490	)		(1,434	)
			(238,763	)		(233,036	)
	Income before income taxes		156,341			183,436
	Benefit for income taxes		56,305			2,664
	Net income		212,646			186,100
	Less: Net income attributable to noncontrolling interests		(42,796	)		(83,448	)
	Net income attributable to MGM Resorts International	$	169,850		$	102,652

Related_Party_Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	NOTE 11 — RELATED PARTY TRANSACTIONS
	MGM China. MGM Branding and Development Holdings, Ltd. (together with its subsidiary MGM Development Services, Ltd., “MGM Branding and Development”), an entity included in the Company’s consolidated financial statements in which Ms. Ho, Pansy Catilina Chiu King indirectly holds a noncontrolling interest, entered into a brand license agreement with MGM China. MGM China pays a license fee to MGM Branding and Development equal to 1.75% of MGM China’s consolidated net revenue, subject to an annual cap of $52 million in 2015 with a 20% increase per annum during the agreement term. During the three months ended March 31, 2015 and 2014, MGM China incurred total license fees of $11 million and $16 million, respectively. Such amounts have been eliminated in consolidation.
	MGM China entered into a development services agreement with MGM Branding and Development to provide certain development services to MGM China in connection with future expansion of existing projects and development of future resort gaming projects. Such services are subject to a development fee which is calculated separately for each resort casino property upon commencement of development. For each such property, the fee is 2.625% of project costs, to be paid in installments as certain benchmarks are achieved. Project costs are the total costs incurred for the design, development and construction of the casino, casino hotel, integrated resort and other related sites associated with each project, including costs of construction, fixtures and fittings, signage, gaming and other supplies and equipment and all costs associated with the opening of the business to be conducted at each project but excluding the cost of land and gaming concessions and financing costs. The development fee for MGM Cotai is subject to a cap of $27 million in 2015, which will increase by 10% per annum for each year during the term of the agreement. During the three months ended March 31, 2015, MGM China paid $10 million of fees to MGM Branding and Development related to development services. Such amounts have been eliminated in consolidation. No fee was paid during the three months ended March 31, 2014.

Condensed_Consolidating_Financ

Condensed Consolidating Financial Information	3 Months Ended
	Mar. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Condensed Consolidating Financial Information	NOTE 12 — CONDENSED CONSOLIDATING FINANCIAL INFORMATION
	The Company’s domestic subsidiaries, excluding certain minor subsidiaries, its domestic insurance subsidiaries, MGM Grand Detroit, LLC, MGM National Harbor, LLC and Blue Tarp reDevelopment, LLC (the company that will own and operate the Company’s casino resort in Springfield, Massachusetts), and each of their respective subsidiaries, have fully and unconditionally guaranteed, on a joint and several basis, payment of the senior credit facility and the outstanding debt securities. The Company’s international subsidiaries, including MGM China, are not guarantors of such indebtedness. Separate condensed financial statement information for the subsidiary guarantors and non-guarantors as of March 31, 2015 and December 31, 2014, and for the three months ended March 31, 2015 and 2014, are presented below.
	CONDENSED CONSOLIDATING BALANCE SHEET INFORMATION
		At March 31, 2015
		Parent			Guarantor			Non-Guarantor			Elimination			Consolidated
					Subsidiaries			Subsidiaries
		(In thousands)
	Current assets	$	1,206,649		$	861,068		$	889,268		$	(378	)	$	2,956,607
	Property and equipment, net		—			12,425,331			2,148,592			(11,972	)		14,561,951
	Investments in subsidiaries		20,727,345			3,916,769			—			(24,644,114	)		—
	Investments in and advances to unconsolidated affiliates		—			1,628,720			7,724			25,000			1,661,444
	Intercompany accounts		—			2,389,327			—			(2,389,327	)		—
	Other non-current assets		134,077			429,070			7,055,298			—			7,618,445
		$	22,068,071		$	21,650,285		$	10,100,882		$	(27,020,791	)	$	26,798,447
	Current liabilities	$	270,376		$	958,446		$	667,317		$	(378	)	$	1,895,761
	Intercompany accounts		2,103,314			—			286,013			(2,389,327	)		—
	Deferred income taxes, net		2,238,007			—			309,143			—			2,547,150
	Long-term debt		13,145,313			4,837			1,401,660			—			14,551,810
	Other long-term obligations		37,943			70,525			42,223			—			150,691
	Total liabilities		17,794,953			1,033,808			2,706,356			(2,389,705	)		19,145,412
	MGM Resorts stockholders' equity		4,273,118			20,616,477			4,014,609			(24,631,086	)		4,273,118
	Noncontrolling interests		—			—			3,379,917			—			3,379,917
	Total stockholders' equity		4,273,118			20,616,477			7,394,526			(24,631,086	)		7,653,035
		$	22,068,071		$	21,650,285		$	10,100,882		$	(27,020,791	)	$	26,798,447
		At December 31, 2014
		Parent			Guarantor			Non-Guarantor			Elimination			Consolidated
					Subsidiaries			Subsidiaries
		(In thousands)
	Current assets	$	1,390,806		$	868,688		$	768,335		$	(669	)	$	3,027,160
	Property and equipment, net		—			12,445,086			2,008,428			(11,972	)		14,441,542
	Investments in subsidiaries		20,430,160			3,896,365			—			(24,326,525	)		—
	Investments in and advances to unconsolidated affiliates		—			1,526,446			7,588			25,000			1,559,034
	Intercompany accounts		—			2,175,091			—			(2,175,091	)		—
	Other non-current assets		141,035			414,801			7,118,939			—			7,674,775
		$	21,962,001		$	21,326,477		$	9,903,290		$	(26,489,257	)	$	26,702,511
	Current liabilities	$	1,680,319		$	953,179		$	775,097		$	(670	)	$	3,407,925
	Intercompany accounts		1,932,780			—			242,311			(2,175,091	)		—
	Deferred income taxes, net		2,312,828			—			309,032			—			2,621,860
	Long-term debt		11,907,534			4,837			1,001,511			—			12,913,882
	Other long-term obligations		37,623			58,016			34,931			—			130,570
	Total liabilities		17,871,084			1,016,032			2,362,882			(2,175,761	)		19,074,237
	MGM Resorts stockholders' equity		4,090,917			20,310,445			4,003,051			(24,313,496	)		4,090,917
	Noncontrolling interests		—			—			3,537,357			—			3,537,357
	Total stockholders' equity		4,090,917			20,310,445			7,540,408			(24,313,496	)		7,628,274
		$	21,962,001		$	21,326,477		$	9,903,290		$	(26,489,257	)	$	26,702,511
	CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME INFORMATION
		Three Months Ended March 31, 2015
		Parent			Guarantor			Non-Guarantor			Elimination			Consolidated
					Subsidiaries			Subsidiaries
		(In thousands)
	Net revenues	$	—		$	1,569,282		$	763,685		$	(723	)	$	2,332,244
	Equity in subsidiaries' earnings		327,766			44,966			—			(372,732	)		—
	Expenses
	Casino and hotel operations		1,500			937,439			513,904			(723	)		1,452,120
	General and administrative		1,201			269,554			57,418			—			328,173
	Corporate expense		15,516			35,204			(364	)		—			50,356
	Preopening and start-up expenses		—			917			14,954			—			15,871
	Property transactions, net		—			1,257			332			—			1,589
	Depreciation and amortization		—			127,818			78,594			—			206,412
			18,217			1,372,189			664,838			(723	)		2,054,521
	Income from unconsolidated affiliates		—			117,265			116			—			117,381
	Operating income (loss)		309,549			359,324			98,963			(372,732	)		395,104
	Interest expense, net of amounts capitalized		(211,077	)		(288	)		(4,897	)		—			(216,262	)
	Other, net		12,879			(20,738	)		(14,642	)		—			(22,501	)
Income (loss) before income taxes		111,351			338,298			79,424			(372,732	)		156,341
Benefit (provision) for income taxes		58,499			(1,686	)		(508	)		—			56,305
Net income (loss)		169,850			336,612			78,916			(372,732	)		212,646
Less: Net income attributable to noncontrolling interests		—			—			(42,796	)		—			(42,796	)
Net income (loss) attributable to MGM Resorts International	$	169,850		$	336,612		$	36,120		$	(372,732	)	$	169,850
Net income (loss)	$	169,850		$	336,612		$	78,916		$	(372,732	)	$	212,646
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment		1,261			1,261			2,476			(2,522	)		2,476
Other		(672	)		(672	)		—			672			(672	)
Other comprehensive income (loss)		589			589			2,476			(1,850	)		1,804
Comprehensive income (loss)		170,439			337,201			81,392			(374,582	)		214,450
Less: Comprehensive income attributable to noncontrolling interests		—			—			(44,011	)		—			(44,011	)
Comprehensive income (loss) attributable to MGM Resorts International	$	170,439		$	337,201		$	37,381		$	(374,582	)	$	170,439
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS INFORMATION
	Three Months Ended March 31, 2015
	Parent			Guarantor			Non-Guarantor			Elimination			Consolidated
				Subsidiaries			Subsidiaries
	(In thousands)
Cash flows from operating activities
Net cash provided by (used in) operating activities	$	(217,074	)	$	293,772		$	98,950		$	—		$	175,648
Cash flows from investing activities
Capital expenditures, net of construction payable		—			(105,509	)		(186,820	)		—			(292,329	)
Dispositions of property and equipment		—			100			64			—			164
Investments in and advances to unconsolidated affiliates		(140,732	)		(19,347	)		—			—			(160,079	)
Distributions from unconsolidated affiliates in excess of earnings		—			1,111			—			—			1,111
Cash deposits - original maturities longer than 90 days		570,000			—			—			—			570,000
Intercompany accounts		—			(214,237	)		—			214,237			—
Other		—			(2,070	)		—			—			(2,070	)
Net cash provided by (used in) investing activities		429,268			(339,952	)		(186,756	)		214,237			116,797
Cash flows from financing activities
Net repayments under bank credit facilities - maturities of 90 days or less		(1,267,625	)		—			(51,001	)		—			(1,318,626	)
Borrowings under bank credit facilities - maturities longer than 90 days		1,260,625			—			450,000			—			1,710,625
Intercompany accounts		187,337			10,520			16,380			(214,237	)		—
Distributions to noncontrolling interest owners		—			—			(202,624	)		—			(202,624	)
Other		(152	)		(2	)		2			—			(152	)
Net cash provided by (used in) financing activities		180,185			10,518			212,757			(214,237	)		189,223
Effect of exchange rate on cash		—			—			704			—			704
Cash and cash equivalents
Net increase (decrease) for the period		392,379			(35,662	)		125,655			—			482,372
Change in cash related to assets held for sale		—			(552	)		—			—			(552	)
Balance, beginning of period		799,508			255,655			658,552			—			1,713,715
Balance, end of period	$	1,191,887		$	219,441		$	784,207		$	—		$	2,195,535
CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME INFORMATION
	Three Months Ended March 31, 2014
	Parent			Guarantor			Non-Guarantor			Elimination			Consolidated
				Subsidiaries			Subsidiaries
	(In thousands)
Net revenues	$	—		$	1,556,329		$	1,074,662		$	(593	)	$	2,630,398
Equity in subsidiaries' earnings		302,318			93,369			—			(395,687	)		—
Expenses
Casino and hotel operations		1,254			921,974			727,460			(593	)		1,650,095
General and administrative		1,112			260,640			57,494			—			319,246
Corporate expense		16,739			33,586			3,026			—			53,351
Preopening and start-up expenses		—			1,991			3,645			—			5,636
Property transactions, net		—			494			64			—			558
Depreciation and amortization		—			128,075			79,580			—			207,655
		19,105			1,346,760			871,269			(593	)		2,236,541
Income from unconsolidated affiliates		—			22,562			53			—			22,615
Operating income (loss)		283,213			325,500			203,446			(395,687	)		416,472
Interest expense, net of amounts capitalized		(200,897	)		(104	)		(8,386	)		—			(209,387	)
Other, net		18,590			(22,855	)		(19,384	)		—			(23,649	)
Income (loss) before income taxes		100,906			302,541			175,676			(395,687	)		183,436
Benefit (provision) for income taxes		1,746			1,641			(723	)		—			2,664
Net income (loss)		102,652			304,182			174,953			(395,687	)		186,100
Less: Net income attributable to noncontrolling interests		—			—			(83,448	)		—			(83,448	)
Net income (loss) attributable to MGM Resorts International	$	102,652		$	304,182		$	91,505		$	(395,687	)	$	102,652
Net income (loss)	$	102,652		$	304,182		$	174,953		$	(395,687	)	$	186,100
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment		(1,517	)		(1,517	)		(2,760	)		3,034			(2,760	)
Other		1,250			1,250			—			(1,250	)		1,250
Other comprehensive income (loss)		(267	)		(267	)		(2,760	)		1,784			(1,510	)
Comprehensive income (loss)		102,385			303,915			172,193			(393,903	)		184,590
Less: Comprehensive income attributable to noncontrolling interests		—			—			(82,205	)		—			(82,205	)
Comprehensive income (loss) attributable to MGM Resorts International	$	102,385		$	303,915		$	89,988		$	(393,903	)	$	102,385
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS INFORMATION
	Three Months Ended March 31, 2014
	Parent			Guarantor			Non-Guarantor			Elimination			Consolidated
				Subsidiaries			Subsidiaries
	(In thousands)
Cash flows from operating activities
Net cash provided by (used in) operating activities	$	(186,046	)	$	301,590		$	150,251		$	25,000		$	290,795
Cash flows from investing activities
Capital expenditures, net of construction payable		—			(69,530	)		(123,221	)		—			(192,751	)
Dispositions of property and equipment		—			69			66			—			135
Investments in and advances to unconsolidated affiliates		(5,200	)		(1,975	)		—			(25,000	)		(32,175	)
Distributions from unconsolidated affiliates in excess of earnings		—			497			—			—			497
Investments in treasury securities - maturities longer than 90 days		—			(54,064	)		—			—			(54,064	)
Proceeds from treasury securities - maturities longer than 90 days		—			63,063			—			—			63,063
Intercompany accounts		—			(248,319	)		—			248,319			–
Other		—			1,226			—			—			1,226
Net cash provided by (used in) investing activities		(5,200	)		(309,033	)		(123,155	)		223,319			(214,069	)
Cash flows from financing activities
Net repayments under bank credit facilities - maturities of 90 days or less		(1,285,125	)		—			(450,000	)		—			(1,735,125	)
Borrowings under bank credit facilities - maturities longer than 90 days		1,278,125			—			450,000			—			1,728,125
Retirement of senior notes		(508,900	)		—			—			—			(508,900	)
Intercompany accounts		515,595			(9,057	)		(258,219	)		(248,319	)		—
Distributions to noncontrolling interest owners		—			—			(247,140	)		—			(247,140	)
Other		(1,202	)		—			(446	)		—			(1,648	)
Net cash used in financing activities		(1,507	)		(9,057	)		(505,805	)		(248,319	)		(764,688	)
Effect of exchange rate on cash		—			—			(971	)		—			(971	)
Cash and cash equivalents
Net decrease for the period		(192,753	)		(16,500	)		(479,680	)		—			(688,933	)
Balance, beginning of period		378,660			237,457			1,187,552			—			1,803,669
Balance, end of period	$	185,907		$	220,957		$	707,872		$	—		$	1,114,736

Basis_of_Presentation_and_Sign1

Basis of Presentation and Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of presentation
	Basis of presentation. As permitted by the rules and regulations of the Securities and Exchange Commission, certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been condensed or omitted. These consolidated financial statements should be read in conjunction with the Company’s 2014 annual consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.
	In the opinion of management, the accompanying unaudited consolidated financial statements contain all adjustments, which include only normal recurring adjustments, necessary to present fairly the Company’s interim financial statements. The results for such periods are not necessarily indicative of the results to be expected for the full year.
	The consolidated financial statements have been retroactively adjusted to reflect the Company’s investment in Borgata under the equity method for all periods presented in this quarterly report. The impact of the retroactive adjustments on net income for the three months ended March 31, 2014 was a decrease of $6 million.
Fair value measurements
	Fair value measurements. Fair value measurements affect the Company’s accounting and impairment assessments of its long-lived assets, investments in unconsolidated affiliates, cost method investments, assets acquired and liabilities assumed in an acquisition, and goodwill and other intangible assets. Fair value measurements also affect the Company’s accounting for certain of its financial assets and liabilities. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date and is measured according to a hierarchy that includes: Level 1 inputs, such as quoted prices in an active market; Level 2 inputs, which are observable inputs for similar assets; or Level 3 inputs, which are unobservable inputs. The Company uses Level 1 inputs for its long-term debt fair value disclosures. See Note 5.
Property and equipment	Property and equipment. As of March 31, 2015, the Company had accrued $8 million for property and equipment within “Accounts payable” and $28 million related to construction retention in “Other long-term obligations.” In addition, during the three months ended March 31, 2015, the Company entered into capital leases with obligations of $16 million.
Income tax provision
	Income tax provision. For interim income tax reporting the Company estimates its annual effective tax rate and applies it to its year-to-date ordinary income. The tax effects of unusual or infrequently occurring items, including changes in judgment about valuation allowances and effects of changes in tax laws or rates, are reported in the interim period in which they occur. The Company’s effective income tax rate was (36%) for the three months ended March 31, 2015.
	The Company recognizes deferred tax assets, net of applicable reserves, related to tax loss and credit carryforwards and other temporary differences with a future tax benefit to the extent that realization of such benefit is more likely than not. Otherwise, a valuation allowance is applied. As of December 31, 2014, the scheduled future reversal of existing U.S. federal taxable temporary differences exceeds the scheduled future reversal of existing U.S. federal deductible temporary differences.  Consequently, the Company no longer applies a valuation allowance against its domestic deferred tax assets other than its foreign tax credit deferred tax asset.
	The Company generates significant excess foreign tax credits each year that are attributable to the Macau Special Gaming Tax which is 35% of gross gaming revenue in Macau.  Because MGM China is presently exempt from the Macau 12% complementary tax on gaming profits, the Company believes that payment of the Macau Special Gaming Tax qualifies as a tax paid in lieu of an income tax that is creditable against U.S. taxes. As long as the exemption from Macau’s 12% complementary tax on gaming profits continues, the Company expects that it will generate excess foreign tax credits on an annual basis and that none of the excess foreign credits will be utilized until the exemption expires. Although the Company’s current five-year exemption from the Macau 12% complementary tax on gaming profits ends on December 31, 2016, the Company believes it will be entitled to receive a third five-year exemption from Macau based upon exemptions granted to the Company’s competitors in order to ensure non-discriminatory treatment among gaming concessionaires and subconcessionaires. For all periods beyond December 31, 2021, the Company has assumed that it will be paying the Macau 12% complementary tax on gaming profits and will thus not be able to credit the Macau Special Gaming Tax in such years, and has factored that assumption into its assessment of the realization of the foreign tax credit deferred tax asset.  Furthermore, the Company does not rely on future U.S. source operating income in assessing future foreign tax credit realization due to its history of recent losses in the U.S. and therefore only relies on U.S. federal taxable temporary differences that it expects will reverse during the 10-year foreign tax credit carryover period.
	The Company projects that it will be able to realize a benefit and, hence, projects that it will record a deferred tax asset for foreign tax credits, net of valuation allowance, of approximately $252 million as of December 31, 2015 and has reflected this assumption in its annual effective tax rate for 2015. The Company’s assessment of realization of its foreign tax credit deferred tax asset is based on available evidence, including assumptions about future profitability of and distributions from MGM China, as well as its assumption concerning renewals of the five-year exemption from Macau’s 12% complementary tax on gaming profits.  As a result, significant judgment is required in assessing the possible need for a valuation allowance and changes to such assumptions may have a material impact on the amount of the valuation allowance.  For example, should the Company in a future period actually receive or be able to assume an additional five-year exemption, an additional valuation allowance would likely need to be provided on some portion or all of the foreign tax credit deferred tax asset, resulting in an increase in the provision for income taxes in such period and such increase may be material.  In addition, a change to forecasts of future profitability of, and distributions from, MGM China could also result in a material change in the valuation allowance with a corresponding impact on the provision for income taxes in such period.
Recently issued accounting standards
	Recently issued accounting standards. In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers,” (“ASU 2014-09”), which is effective for fiscal years, and interim periods within those years, beginning on or after December 15, 2016. ASU 2014-09 outlines a new, single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. This new revenue recognition model provides a five-step analysis in determining when and how revenue is recognized. Additionally, the new model will require revenue recognition to depict the transfer of promised goods or services to customers in an amount that reflects the consideration a company expects to receive in exchange for those goods or services. The Company is currently assessing the impact that adoption of ASU 2014-09 will have on its consolidated financial statements and footnote disclosures.
	In February 2015, the FASB issued Accounting Standards Update No. 2015-02, “Amendments to the Consolidation Analysis,” (“ASU 2015-02”), which is effective for fiscal years, and interim periods within those years, beginning after December 15, 2015.  ASU 2015-02 amends: the assessment of whether a limited partnership is a variable interest entity; the effect that fees paid to a decision maker have on the consolidation analysis; how variable interests held by a reporting entity’s related parties or de facto agents affect its consolidation conclusion; and for entities other than limited partnerships, clarifies how to determine whether the equity holders as a group have power over an entity. The Company is currently assessing the impact that adoption of ASU 2015-02 will have on its consolidated financial statements and footnote disclosures.

Investments_in_and_Advances_to1

Investments in and Advances to Unconsolidated Affiliates (Tables)	3 Months Ended
	Mar. 31, 2015
Schedule of Investments in and Advances to Unconsolidated Affiliates	Investments in and advances to unconsolidated affiliates consisted of the following:
		March 31,			December 31,
		2015			2014
		(In thousands)
	CityCenter Holdings, LLC – CityCenter (50%)	$	1,305,707		$	1,221,306
	Elgin Riverboat Resort–Riverboat Casino – Grand Victoria (50%)		140,052			141,162
	Marina District Development Company – Borgata (50%)		112,333			109,252
	Other		103,352			87,314
		$	1,661,444		$	1,559,034
Schedule of Share of Results of Operations of Unconsolidated Affiliates	The Company recorded its share of the results of operations of unconsolidated affiliates as follows:
		Three Months Ended
		March 31,
		2015			2014
		(In thousands)
	Income from unconsolidated affiliates	$	117,381		$	22,615
	Preopening and start-up expenses		(673	)		(19	)
	Non-operating items from unconsolidated affiliates		(19,011	)		(22,215	)
		$	97,697		$	381
CityCenter Holdings, LLC [Member]
Summarized Balance Sheet Information	Summarized balance sheet information for CityCenter is as follows:
		March 31,			December 31,
		2015			2014
		(In thousands)
	Current assets	$	666,600		$	561,904
	Property and other assets, net		7,830,931			7,883,709
	Current liabilities		255,659			508,168
	Long-term debt and other long-term obligations		1,553,008			1,552,913
	Equity		6,688,864			6,384,532
Summarized Income Statement Information	Summarized income statement information for CityCenter is as follows:
		Three Months Ended
		March 31,
		2015			2014
		(In thousands)
	Net revenues	$	318,239		$	336,417
	Operating expenses		(136,633	)		(331,454	)
	Operating income		181,606			4,963
	Non-operating expenses		(18,005	)		(25,165	)
	Net income (loss)	$	163,601		$	(20,202	)

LongTerm_Debt_Tables

Long-Term Debt (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Schedule of Long-Term Debt	Long-term debt consisted of the following:
		March 31,		December 31,
		2015		2014
		(In thousands)
	Senior credit facility:
	$2,737 million ($2,744 million at December 31, 2014) term loans, net	$	2,731,392	$	2,738,118
	MGM Grand Paradise credit facility:
	$550 million term loans		553,376		553,177
	Revolving loans		399,876		—
	$1,450 million 4.25% convertible senior notes, due 2015, net		1,450,201		1,451,405
	$875 million 6.625% senior notes, due 2015, net		875,200		875,370
	$242.9 million 6.875% senior notes, due 2016		242,900		242,900
	$732.7 million 7.5% senior notes, due 2016		732,749		732,749
	$500 million 10% senior notes, due 2016, net		498,212		497,955
	$743 million 7.625% senior notes, due 2017		743,000		743,000
	$475 million 11.375% senior notes, due 2018, net		469,347		468,949
	$850 million 8.625% senior notes, due 2019		850,000		850,000
	$500 million 5.25% senior notes, due 2020		500,000		500,000
	$1,000 million 6.75% senior notes, due 2020		1,000,000		1,000,000
	$1,250 million 6.625% senior notes, due 2021		1,250,000		1,250,000
	$1,000 million 7.75% senior notes, due 2022		1,000,000		1,000,000
	$1,250 million 6% senior notes, due 2023, net		1,250,720		1,250,742
	$0.6 million 7% debentures, due 2036, net		572		572
	$4.3 million 6.7% debentures, due 2096		4,265		4,265
			14,551,810		14,159,202
	Less: Current portion		—		(1,245,320	)
		$	14,551,810	$	12,913,882

Income_Loss_Per_Share_of_Commo1

Income (Loss) Per Share of Common Stock (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Schedule of Weighted-Average Number of Common and Common Equivalent Shares Used in the Calculation of Basic and Diluted Income Per Share	The weighted-average number of common and common equivalent shares used in the calculation of basic and diluted income per share consisted of the following:
		Three Months Ended
		March 31,
		2015			2014
		(In thousands)
	Numerator:
	Net income attributable to MGM Resorts International - basic	$	169,850		$	102,652
	Interest on convertible debt, net of tax		19,967			2,195
	Potentially dilutive effect due to MGM China Share Option Plan		(8	)		(132	)
	Net income attributable to MGM Resorts International - diluted	$	189,809		$	104,715
	Denominator:
	Weighted-average common shares outstanding - basic		491,422			490,542
	Potential dilution from share-based awards		5,836			6,453
	Potential dilution from assumed conversion of convertible debt		78,054			16,149
	Weighted-average common and common equivalent shares - diluted		575,312			513,144
	Antidilutive share-based awards excluded from the calculation of diluted		4,627			2,625
	earnings per share

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Changes in Stockholders' Equity	The following table presents the Company’s changes in stockholders’ equity for the three months ended March 31, 2015:
		MGM Resorts
		International						Total
		Stockholders'			Noncontrolling			Stockholders'
		Equity			Interests			Equity
		(In thousands)
	Balances, January 1, 2015	$	4,090,917		$	3,537,357		$	7,628,274
	Net income		169,850			42,796			212,646
	Currency translation adjustment		1,261			1,215			2,476
	Other comprehensive loss from unconsolidated affiliate, net		(672	)		—			(672	)
	Stock-based compensation		9,350			1,352			10,702
	Change in excess tax benefit from stock-based compensation		(2,166	)		—			(2,166	)
	Issuance of common stock pursuant to stock-based compensation awards		(294	)		—			(294	)
	Cash distributions to noncontrolling interest owners		—			(202,803	)		(202,803	)
	Issuance of performance share units		4,872			—			4,872
	Balances, March 31, 2015	$	4,273,118		$	3,379,917		$	7,653,035
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) Attributable to MGM Resorts International by Component	Changes in accumulated other comprehensive income (loss) attributable to MGM Resorts International by component are as follows:
		Currency
		Translation			Other
		Adjustment			Adjustments			Total
		(In thousands)
	Balances, January 1, 2015	$	12,319		$	672		$	12,991
	Current period other comprehensive income (loss)		1,261			(672	)		589
	Balances, March 31, 2015	$	13,580		$	—		$	13,580

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2015
Schedule of Compensation Cost Recognized	Recognition of compensation cost. Compensation cost for both the Omnibus Plan and MGM China Plan was recognized as follows:
		Three Months Ended
		March 31,
		2015			2014
		(In thousands)
	Compensation cost:
	Omnibus Plan	$	7,942		$	7,002
	MGM China Plan		2,760			1,461
	Total compensation cost		10,702			8,463
	Less:  Reimbursed costs and capitalized cost		(290	)		(268	)
	Compensation cost after reimbursed costs and capitalized cost		10,412			8,195
	Less:  Related tax benefit		(2,634	)		(2,317	)
	Compensation cost, net of tax benefit	$	7,778		$	5,878
Omnibus Plan [Member]
Summary of Stock Options and Stock Appreciation Rights Activity	Stock options and stock appreciation rights (“SARs”)
		Units			Weighted Average
		(000’s)			Exercise Price
	Outstanding at January 1, 2015		16,176		$	15.27
	Granted		12			20.03
	Exercised		(163	)		14.1
	Forfeited or expired		(856	)		35.27
	Outstanding at March 31, 2015		15,169			14.2
	Exercisable at March 31, 2015		9,824			12.34
Schedule of Restricted Stock Units and Performance Share Units Activity	Restricted stock units (“RSUs”) and performance share units (“PSUs”)
		RSUs						PSUs
					Weighted					Weighted		Weighted
					Average					Average		Average
		Units			Grant-Date			Units		Grant-Date		Target
		(000’s)			Fair Value			(000’s)		Fair Value		Price
	Nonvested at January 1, 2015		1,358		$	18.27			1,455	$	15.14	$	20.48
	Forfeited		(15	)		18.08			—		—		—
	Nonvested at March 31, 2015		1,343			18.27			1,455		15.14		20.48
Summary of Bonus Performance Share Units Activity	Bonus PSUs
		Units			Weighted Average
		(000’s)			Target Price
	Outstanding at January 1, 2015		265		$	31.72
	Granted		229			25.91
	Outstanding at March 31, 2015		494			29.03
MGM China Plan [Member]
Summary of Stock Options Activity	A summary of activity under the MGM China Plan for the three months ended March 31, 2015 is presented below:
	Stock options
		Units			Weighted Average
		(000’s)			Exercise Price
	Outstanding at January 1, 2015		35,058		$	2.85
	Granted		710			2.48
	Outstanding at March 31, 2015		35,768			2.84
	Exercisable at March 31, 2015		10,642			2.05

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Schedule of Segment Information	The following tables present the Company’s segment information:
		Three Months Ended
		March 31,
		2015			2014
		(In thousands)
	Net Revenues
	Wholly owned domestic resorts	$	1,577,895		$	1,570,234
	MGM China		630,087			941,448
	Reportable segment net revenues		2,207,982			2,511,682
	Corporate and other		124,262			118,716
		$	2,332,244		$	2,630,398
	Adjusted Property EBITDA
	Wholly owned domestic resorts	$	389,879		$	402,846
	MGM China		148,456			240,725
	Reportable segment Adjusted Property EBITDA		538,335			643,571
	Other operating income (expense)
	Corporate and other, net		80,641			(13,250	)
	Preopening and start-up expenses		(15,871	)		(5,636	)
	Property transactions, net		(1,589	)		(558	)
	Depreciation and amortization		(206,412	)		(207,655	)
	Operating income		395,104			416,472
	Non-operating income (expense)
	Interest expense, net of amounts capitalized		(216,262	)		(209,387	)
	Non-operating items from unconsolidated affiliates		(19,011	)		(22,215	)
	Other, net		(3,490	)		(1,434	)
			(238,763	)		(233,036	)
	Income before income taxes		156,341			183,436
	Benefit for income taxes		56,305			2,664
	Net income		212,646			186,100
	Less: Net income attributable to noncontrolling interests		(42,796	)		(83,448	)
	Net income attributable to MGM Resorts International	$	169,850		$	102,652

Condensed_Consolidating_Financ1

Condensed Consolidating Financial Information (Tables)	3 Months Ended
	Mar. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Schedule of Condensed Consolidating Balance Sheet Information
	CONDENSED CONSOLIDATING BALANCE SHEET INFORMATION
		At March 31, 2015
		Parent			Guarantor			Non-Guarantor			Elimination			Consolidated
					Subsidiaries			Subsidiaries
		(In thousands)
	Current assets	$	1,206,649		$	861,068		$	889,268		$	(378	)	$	2,956,607
	Property and equipment, net		—			12,425,331			2,148,592			(11,972	)		14,561,951
	Investments in subsidiaries		20,727,345			3,916,769			—			(24,644,114	)		—
	Investments in and advances to unconsolidated affiliates		—			1,628,720			7,724			25,000			1,661,444
	Intercompany accounts		—			2,389,327			—			(2,389,327	)		—
	Other non-current assets		134,077			429,070			7,055,298			—			7,618,445
		$	22,068,071		$	21,650,285		$	10,100,882		$	(27,020,791	)	$	26,798,447
	Current liabilities	$	270,376		$	958,446		$	667,317		$	(378	)	$	1,895,761
	Intercompany accounts		2,103,314			—			286,013			(2,389,327	)		—
	Deferred income taxes, net		2,238,007			—			309,143			—			2,547,150
	Long-term debt		13,145,313			4,837			1,401,660			—			14,551,810
	Other long-term obligations		37,943			70,525			42,223			—			150,691
	Total liabilities		17,794,953			1,033,808			2,706,356			(2,389,705	)		19,145,412
	MGM Resorts stockholders' equity		4,273,118			20,616,477			4,014,609			(24,631,086	)		4,273,118
	Noncontrolling interests		—			—			3,379,917			—			3,379,917
	Total stockholders' equity		4,273,118			20,616,477			7,394,526			(24,631,086	)		7,653,035
		$	22,068,071		$	21,650,285		$	10,100,882		$	(27,020,791	)	$	26,798,447
		At December 31, 2014
		Parent			Guarantor			Non-Guarantor			Elimination			Consolidated
					Subsidiaries			Subsidiaries
		(In thousands)
	Current assets	$	1,390,806		$	868,688		$	768,335		$	(669	)	$	3,027,160
	Property and equipment, net		—			12,445,086			2,008,428			(11,972	)		14,441,542
	Investments in subsidiaries		20,430,160			3,896,365			—			(24,326,525	)		—
	Investments in and advances to unconsolidated affiliates		—			1,526,446			7,588			25,000			1,559,034
	Intercompany accounts		—			2,175,091			—			(2,175,091	)		—
	Other non-current assets		141,035			414,801			7,118,939			—			7,674,775
		$	21,962,001		$	21,326,477		$	9,903,290		$	(26,489,257	)	$	26,702,511
	Current liabilities	$	1,680,319		$	953,179		$	775,097		$	(670	)	$	3,407,925
	Intercompany accounts		1,932,780			—			242,311			(2,175,091	)		—
	Deferred income taxes, net		2,312,828			—			309,032			—			2,621,860
	Long-term debt		11,907,534			4,837			1,001,511			—			12,913,882
	Other long-term obligations		37,623			58,016			34,931			—			130,570
	Total liabilities		17,871,084			1,016,032			2,362,882			(2,175,761	)		19,074,237
	MGM Resorts stockholders' equity		4,090,917			20,310,445			4,003,051			(24,313,496	)		4,090,917
	Noncontrolling interests		—			—			3,537,357			—			3,537,357
	Total stockholders' equity		4,090,917			20,310,445			7,540,408			(24,313,496	)		7,628,274
		$	21,962,001		$	21,326,477		$	9,903,290		$	(26,489,257	)	$	26,702,511
Schedule of Condensed Consolidating Statement of Operations and Comprehensive Income Information	CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME INFORMATION
		Three Months Ended March 31, 2015
		Parent			Guarantor			Non-Guarantor			Elimination			Consolidated
					Subsidiaries			Subsidiaries
		(In thousands)
	Net revenues	$	—		$	1,569,282		$	763,685		$	(723	)	$	2,332,244
	Equity in subsidiaries' earnings		327,766			44,966			—			(372,732	)		—
	Expenses
	Casino and hotel operations		1,500			937,439			513,904			(723	)		1,452,120
	General and administrative		1,201			269,554			57,418			—			328,173
	Corporate expense		15,516			35,204			(364	)		—			50,356
	Preopening and start-up expenses		—			917			14,954			—			15,871
	Property transactions, net		—			1,257			332			—			1,589
	Depreciation and amortization		—			127,818			78,594			—			206,412
			18,217			1,372,189			664,838			(723	)		2,054,521
	Income from unconsolidated affiliates		—			117,265			116			—			117,381
	Operating income (loss)		309,549			359,324			98,963			(372,732	)		395,104
	Interest expense, net of amounts capitalized		(211,077	)		(288	)		(4,897	)		—			(216,262	)
	Other, net		12,879			(20,738	)		(14,642	)		—			(22,501	)
	Income (loss) before income taxes		111,351			338,298			79,424			(372,732	)		156,341
	Benefit (provision) for income taxes		58,499			(1,686	)		(508	)		—			56,305
	Net income (loss)		169,850			336,612			78,916			(372,732	)		212,646
	Less: Net income attributable to noncontrolling interests		—			—			(42,796	)		—			(42,796	)
	Net income (loss) attributable to MGM Resorts International	$	169,850		$	336,612		$	36,120		$	(372,732	)	$	169,850
	Net income (loss)	$	169,850		$	336,612		$	78,916		$	(372,732	)	$	212,646
	Other comprehensive income (loss), net of tax:
	Foreign currency translation adjustment		1,261			1,261			2,476			(2,522	)		2,476
	Other		(672	)		(672	)		—			672			(672	)
	Other comprehensive income (loss)		589			589			2,476			(1,850	)		1,804
	Comprehensive income (loss)		170,439			337,201			81,392			(374,582	)		214,450
	Less: Comprehensive income attributable to noncontrolling interests		—			—			(44,011	)		—			(44,011	)
	Comprehensive income (loss) attributable to MGM Resorts International	$	170,439		$	337,201		$	37,381		$	(374,582	)	$	170,439
	CONDENSED CONSOLIDATING STATEMENT OF OPERATIONS AND COMPREHENSIVE INCOME INFORMATION
		Three Months Ended March 31, 2014
		Parent			Guarantor			Non-Guarantor			Elimination			Consolidated
					Subsidiaries			Subsidiaries
		(In thousands)
	Net revenues	$	—		$	1,556,329		$	1,074,662		$	(593	)	$	2,630,398
	Equity in subsidiaries' earnings		302,318			93,369			—			(395,687	)		—
	Expenses
	Casino and hotel operations		1,254			921,974			727,460			(593	)		1,650,095
	General and administrative		1,112			260,640			57,494			—			319,246
	Corporate expense		16,739			33,586			3,026			—			53,351
	Preopening and start-up expenses		—			1,991			3,645			—			5,636
	Property transactions, net		—			494			64			—			558
	Depreciation and amortization		—			128,075			79,580			—			207,655
			19,105			1,346,760			871,269			(593	)		2,236,541
	Income from unconsolidated affiliates		—			22,562			53			—			22,615
	Operating income (loss)		283,213			325,500			203,446			(395,687	)		416,472
	Interest expense, net of amounts capitalized		(200,897	)		(104	)		(8,386	)		—			(209,387	)
	Other, net		18,590			(22,855	)		(19,384	)		—			(23,649	)
	Income (loss) before income taxes		100,906			302,541			175,676			(395,687	)		183,436
	Benefit (provision) for income taxes		1,746			1,641			(723	)		—			2,664
	Net income (loss)		102,652			304,182			174,953			(395,687	)		186,100
	Less: Net income attributable to noncontrolling interests		—			—			(83,448	)		—			(83,448	)
	Net income (loss) attributable to MGM Resorts International	$	102,652		$	304,182		$	91,505		$	(395,687	)	$	102,652
	Net income (loss)	$	102,652		$	304,182		$	174,953		$	(395,687	)	$	186,100
	Other comprehensive income (loss), net of tax:
	Foreign currency translation adjustment		(1,517	)		(1,517	)		(2,760	)		3,034			(2,760	)
	Other		1,250			1,250			—			(1,250	)		1,250
	Other comprehensive income (loss)		(267	)		(267	)		(2,760	)		1,784			(1,510	)
	Comprehensive income (loss)		102,385			303,915			172,193			(393,903	)		184,590
	Less: Comprehensive income attributable to noncontrolling interests		—			—			(82,205	)		—			(82,205	)
	Comprehensive income (loss) attributable to MGM Resorts International	$	102,385		$	303,915		$	89,988		$	(393,903	)	$	102,385
Schedule of Condensed Consolidating Statement of Cash Flows Information
	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS INFORMATION
		Three Months Ended March 31, 2015
		Parent			Guarantor			Non-Guarantor			Elimination			Consolidated
					Subsidiaries			Subsidiaries
		(In thousands)
	Cash flows from operating activities
	Net cash provided by (used in) operating activities	$	(217,074	)	$	293,772		$	98,950		$	—		$	175,648
	Cash flows from investing activities
	Capital expenditures, net of construction payable		—			(105,509	)		(186,820	)		—			(292,329	)
	Dispositions of property and equipment		—			100			64			—			164
	Investments in and advances to unconsolidated affiliates		(140,732	)		(19,347	)		—			—			(160,079	)
	Distributions from unconsolidated affiliates in excess of earnings		—			1,111			—			—			1,111
	Cash deposits - original maturities longer than 90 days		570,000			—			—			—			570,000
	Intercompany accounts		—			(214,237	)		—			214,237			—
	Other		—			(2,070	)		—			—			(2,070	)
	Net cash provided by (used in) investing activities		429,268			(339,952	)		(186,756	)		214,237			116,797
	Cash flows from financing activities
	Net repayments under bank credit facilities - maturities of 90 days or less		(1,267,625	)		—			(51,001	)		—			(1,318,626	)
	Borrowings under bank credit facilities - maturities longer than 90 days		1,260,625			—			450,000			—			1,710,625
	Intercompany accounts		187,337			10,520			16,380			(214,237	)		—
	Distributions to noncontrolling interest owners		—			—			(202,624	)		—			(202,624	)
	Other		(152	)		(2	)		2			—			(152	)
	Net cash provided by (used in) financing activities		180,185			10,518			212,757			(214,237	)		189,223
	Effect of exchange rate on cash		—			—			704			—			704
	Cash and cash equivalents
	Net increase (decrease) for the period		392,379			(35,662	)		125,655			—			482,372
	Change in cash related to assets held for sale		—			(552	)		—			—			(552	)
	Balance, beginning of period		799,508			255,655			658,552			—			1,713,715
	Balance, end of period	$	1,191,887		$	219,441		$	784,207		$	—		$	2,195,535
	CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS INFORMATION
		Three Months Ended March 31, 2014
		Parent			Guarantor			Non-Guarantor			Elimination			Consolidated
					Subsidiaries			Subsidiaries
		(In thousands)
	Cash flows from operating activities
	Net cash provided by (used in) operating activities	$	(186,046	)	$	301,590		$	150,251		$	25,000		$	290,795
	Cash flows from investing activities
	Capital expenditures, net of construction payable		—			(69,530	)		(123,221	)		—			(192,751	)
	Dispositions of property and equipment		—			69			66			—			135
	Investments in and advances to unconsolidated affiliates		(5,200	)		(1,975	)		—			(25,000	)		(32,175	)
	Distributions from unconsolidated affiliates in excess of earnings		—			497			—			—			497
	Investments in treasury securities - maturities longer than 90 days		—			(54,064	)		—			—			(54,064	)
	Proceeds from treasury securities - maturities longer than 90 days		—			63,063			—			—			63,063
	Intercompany accounts		—			(248,319	)		—			248,319			–
	Other		—			1,226			—			—			1,226
	Net cash provided by (used in) investing activities		(5,200	)		(309,033	)		(123,155	)		223,319			(214,069	)
	Cash flows from financing activities
	Net repayments under bank credit facilities - maturities of 90 days or less		(1,285,125	)		—			(450,000	)		—			(1,735,125	)
	Borrowings under bank credit facilities - maturities longer than 90 days		1,278,125			—			450,000			—			1,728,125
	Retirement of senior notes		(508,900	)		—			—			—			(508,900	)
	Intercompany accounts		515,595			(9,057	)		(258,219	)		(248,319	)		—
	Distributions to noncontrolling interest owners		—			—			(247,140	)		—			(247,140	)
	Other		(1,202	)		—			(446	)		—			(1,648	)
	Net cash used in financing activities		(1,507	)		(9,057	)		(505,805	)		(248,319	)		(764,688	)
	Effect of exchange rate on cash		—			—			(971	)		—			(971	)
	Cash and cash equivalents
	Net decrease for the period		(192,753	)		(16,500	)		(479,680	)		—			(688,933	)
	Balance, beginning of period		378,660			237,457			1,187,552			—			1,803,669
	Balance, end of period	$	185,907		$	220,957		$	707,872		$	—		$	1,114,736

Organization_Additional_Inform

Organization - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
	Segment
Organization Disclosure [Line Items]
Number of reportable segments	2
CityCenter Holdings, LLC [Member]
Organization Disclosure [Line Items]
Percentage ownership interest	50.00%	50.00%
Marina District Development Company [Member]
Organization Disclosure [Line Items]
Percentage ownership interest	50.00%	50.00%
Grand Victoria [Member]
Organization Disclosure [Line Items]
Percentage ownership interest	50.00%
Silver Legacy [Member]
Organization Disclosure [Line Items]
Percentage ownership interest	50.00%
Las Vegas Arena Company, LLC [Member]
Organization Disclosure [Line Items]
Percentage ownership interest	50.00%
Boyd [Member] | Borgata [Member]
Organization Disclosure [Line Items]
Percentage ownership interest	50.00%
MGM Hakkasan [Member] | MGM Hakkasan Hospitality [Member]
Organization Disclosure [Line Items]
Percentage ownership interest	50.00%
Co-venturer [Member] | Infinity World Development Corp [Member] | CityCenter Holdings, LLC [Member]
Organization Disclosure [Line Items]
Percentage ownership interest	50.00%
Co-venturer [Member] | Hyatt Gaming [Member] | Grand Victoria [Member]
Organization Disclosure [Line Items]
Percentage ownership interest	50.00%
Co-venturer [Member] | Eldorado LLC [Member] | Silver Legacy [Member]
Organization Disclosure [Line Items]
Percentage ownership interest	50.00%
Scenario, Forecast [Member] | Las Vegas Arena Company, LLC [Member]
Organization Disclosure [Line Items]
Expected development and construction cost, excluding capitalized and land related costs	350,000,000
Scenario, Forecast [Member] | Maximum [Member] | Las Vegas Arena Company, LLC [Member]
Organization Disclosure [Line Items]
Number of seats	20,000
Scenario, Forecast [Member] | Minimum [Member] | Las Vegas Arena Company, LLC [Member]
Organization Disclosure [Line Items]
Number of seats	18,000
MGM China [Member]
Organization Disclosure [Line Items]
Percentage ownership interest	51.00%
MGM Cotai [Member] | Scenario, Forecast [Member]
Organization Disclosure [Line Items]
Expected development and construction cost, excluding capitalized and land related costs	3,000,000,000
MGM Cotai [Member] | Scenario, Forecast [Member] | Maximum [Member]
Organization Disclosure [Line Items]
Number of hotel rooms	1,500
Number of gaming tables	500
Number of slots	1,500
Crystals [Member] | CityCenter Holdings, LLC [Member]
Organization Disclosure [Line Items]
Annual management fee	3,000,000
Aria and Vdara [Member] | CityCenter Holdings, LLC [Member]
Organization Disclosure [Line Items]
Management fee as a percentage of revenues	2.00%
Management fee received, percentage of EBITDA	5.00%
Mgm National Harbor [Member] | Scenario, Forecast [Member]
Organization Disclosure [Line Items]
Number of hotel rooms	300
Number of gaming tables	160
Number of slots	3,600
Expected development and construction cost, excluding capitalized and land related costs	1,300,000,000
Number of seats	3,000
Area of meeting and event space	50,000
Area of retail and restaurant space	79,000
Parking garage space	4,700
Mississippi [Member]
Organization Disclosure [Line Items]
Number of resorts owned and operated	2
Macau [Member] | MGM Cotai [Member] | Scenario, Forecast [Member]
Organization Disclosure [Line Items]
Area of development site (in acres)	18
Massachusetts [Member] | MGM Springfield [Member] | Scenario, Forecast [Member]
Organization Disclosure [Line Items]
Area of development site (in acres)	14.5
Number of hotel rooms	250
Number of gaming tables	100
Number of slots	3,000
Expected development and construction cost, excluding capitalized and land related costs	760,000,000
Area of meeting and event space	33,000
Area of retail and restaurant space	64,000
Parking garage space	3,500

Basis_of_Presentation_and_Sign2

Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2015
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Retroactive adjustments on net income (loss)		$6
Accrual for property and equipment	8
Construction retention accrued	28
Obligations under capital leases	16
Effective income tax rate	-36.00%
Macau [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Special gaming tax rate	35.00%
Macau [Member] | MGM China [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Complementary tax rate (as a percent)	12.00%
Period exempted from complementary tax, second exemption period granted	5 years
Complementary tax exemption expiration date	31-Dec-16
Third exemption period from complementary tax assumed based on third exemption period granted to a competitor	5 years
Tax credit carryforward, description	The Companybs current five-year exemption from the Macau 12% complementary tax on gaming profits ends on December 31, 2016, the Company believes it will be entitled to receive a third five-year exemption from Macau based upon exemptions granted to the Companybs competitors in order to ensure non-discriminatory treatment among gaming concessionaires and subconcessionaires. For all periods beyond December 31, 2021, the Company has assumed that it will be paying the Macau 12% complementary tax on gaming profits and will thus not be able to credit the Macau Special Gaming Tax in such years, and has factored that assumption into its assessment of the realization of the foreign tax credit deferred tax asset. Furthermore, the Company does not rely on future U.S source operating income in assessing future foreign tax credit realization due to its history of recent losses in the U.S. and therefore only relies on U.S. federal taxable temporary differences that it expects will reverse during the 10-year foreign tax credit carryover period.
Foreign tax credit carry forward expiration period	10 years
Macau [Member] | MGM China [Member] | Foreign Tax Authority [Member] | Scenario, Forecast [Member]
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Net deferred foreign tax credit asset			$252

Assets_Held_for_Sale_Additiona

Assets Held for Sale - Additional Information (Detail) (Assets Held-for-sale [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014	Apr. 01, 2015	Apr. 30, 2015
In Millions, unless otherwise specified
Railroad Pass Hotel & Casino [Member]
Long Lived Assets Held For Sale [Line Items]
Assets held for sale	$10	$9
Liabilities held for sale	1	2
Gold Strike Hotel & Gambling Hall [Member]
Long Lived Assets Held For Sale [Line Items]
Assets held for sale	14	14
Liabilities held for sale	2	2
Subsequent Event [Member] | Railroad Pass Hotel & Casino [Member]
Long Lived Assets Held For Sale [Line Items]
Contingent upon regulatory approvals and other customary closing conditions			8
Subsequent Event [Member] | Gold Strike Hotel & Gambling Hall [Member]
Long Lived Assets Held For Sale [Line Items]
Contingent upon regulatory approvals and other customary closing conditions				$12

Investments_in_and_Advances_to2

Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments in and Advances to Unconsolidated Affiliates (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	$1,661,444	$1,559,034
CityCenter Holdings, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	1,305,707	1,221,306
Elgin Riverboat Resort-Riverboat Casino [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	140,052	141,162
Marina District Development Company [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	112,333	109,252
Other [Member]
Schedule Of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates	$103,352	$87,314

Investments_in_and_Advances_to3

Investments in and Advances to Unconsolidated Affiliates - Schedule of Investments in and Advances to Unconsolidated Affiliates (Parenthetical) (Detail)	Mar. 31, 2015	Dec. 31, 2014
CityCenter Holdings, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Percentage ownership interest	50.00%	50.00%
Elgin Riverboat Resort-Riverboat Casino [Member]
Schedule Of Equity Method Investments [Line Items]
Percentage ownership interest	50.00%	50.00%
Marina District Development Company [Member]
Schedule Of Equity Method Investments [Line Items]
Percentage ownership interest	50.00%	50.00%

Investments_in_and_Advances_to4

Investments in and Advances to Unconsolidated Affiliates - Schedule of Share of Results of Operations of Unconsolidated Affiliates (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Equity Method Investments And Joint Ventures [Abstract]
Income from unconsolidated affiliates	$117,381	$22,615
Preopening and start-up expenses	-673	-19
Non-operating items from unconsolidated affiliates	-19,011	-22,215
Income from unconsolidated affiliates	$97,697	$381

Investments_in_and_Advances_to5

Investments in and Advances to Unconsolidated Affiliates - Summarized Balance Sheet Information (Detail) (CityCenter Holdings, LLC [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
CityCenter Holdings, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Current assets	$666,600	$561,904
Property and other assets, net	7,830,931	7,883,709
Current liabilities	255,659	508,168
Long-term debt and other long-term obligations	1,553,008	1,552,913
Equity	$6,688,864	$6,384,532

Investments_in_and_Advances_to6

Investments in and Advances to Unconsolidated Affiliates - Summarized Income Statement Information (Detail) (CityCenter Holdings, LLC [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
CityCenter Holdings, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Net revenues	$318,239	$336,417
Operating expenses	-136,633	-331,454
Operating income	181,606	4,963
Non-operating expenses	-18,005	-25,165
Net income (loss)	$163,601	($20,202)

Investments_in_and_Advances_to7

Investments in and Advances to Unconsolidated Affiliates - Additional Information (Detail) (USD $)	3 Months Ended	1 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Apr. 30, 2015	Dec. 31, 2014
Schedule Of Equity Method Investments [Line Items]
Recognized property transactions, net	$80
CityCenter Holdings, LLC [Member]
Schedule Of Equity Method Investments [Line Items]
Recognized property transactions, net	160
Percentage ownership interest	50.00%		50.00%
Annual dividend distribution policy Description	Under the annual distribution policy, CityCenter will distribute up to 35% of excess cash flow, subject to the approval of the CityCenter board of directors.
CityCenter Holdings, LLC [Member] | Subsequent Event [Member]
Schedule Of Equity Method Investments [Line Items]
Percentage ownership interest		50.00%
Dividends declared		400
Dividends received		$200

LongTerm_Debt_Schedule_of_Long

Long-Term Debt - Schedule of Long-Term Debt (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Debt Instrument [Line Items]
Long-term debt	$14,551,810	$14,159,202
Less: Current portion		-1,245,320
Long-term debt	14,551,810	12,913,882
4.25% convertible senior notes, due 2015, net [Member]
Debt Instrument [Line Items]
Long-term debt	1,450,201	1,451,405
6.625% senior notes, due 2015, net [Member]
Debt Instrument [Line Items]
Long-term debt	875,200	875,370
6.875% senior notes, due 2016 [Member]
Debt Instrument [Line Items]
Long-term debt	242,900	242,900
7.5% senior notes, due 2016 [Member]
Debt Instrument [Line Items]
Long-term debt	732,749	732,749
10% senior notes, due 2016, net [Member]
Debt Instrument [Line Items]
Long-term debt	498,212	497,955
7.625% senior notes, due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt	743,000	743,000
11.375% senior notes, due 2018, net [Member]
Debt Instrument [Line Items]
Long-term debt	469,347	468,949
8.625% senior notes, due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt	850,000	850,000
5.25% senior notes, due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	500,000	500,000
6.75% senior notes, due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	1,000,000	1,000,000
6.625% senior notes, due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt	1,250,000	1,250,000
7.75% senior notes, due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt	1,000,000	1,000,000
6% senior notes, due 2023, net [Member]
Debt Instrument [Line Items]
Long-term debt	1,250,720	1,250,742
7% debentures, due 2036, net [Member]
Debt Instrument [Line Items]
Long-term debt	572	572
6.7% debentures, due 2096 [Member]
Debt Instrument [Line Items]
Long-term debt	4,265	4,265
Term Loans [Member] | Senior credit facility [Member]
Debt Instrument [Line Items]
Long-term debt	2,731,392	2,738,118
Term Loans [Member] | MGM Grand Paradise credit facility [Member]
Debt Instrument [Line Items]
Long-term debt	553,376	553,177
Revolving Loans [Member] | MGM Grand Paradise credit facility [Member]
Debt Instrument [Line Items]
Long-term debt	$399,876

LongTerm_Debt_Schedule_of_Long1

Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) (USD $)	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Apr. 30, 2010
Term Loans [Member] | MGM Grand Paradise credit facility [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	$550
Term Loans [Member] | Senior credit facility [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	2,737	2,744
4.25% convertible senior notes, due 2015, net [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	1,450	1,450	1,150
Long-term debt, interest rate (as a percent)	4.25%	4.25%
Long-term debt, maturity year	2015	2015
6.625% senior notes, due 2015, net [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	875	875
Long-term debt, interest rate (as a percent)	6.63%	6.63%
Long-term debt, maturity year	2015	2015
6.875% senior notes, due 2016 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	242.9	242.9
Long-term debt, interest rate (as a percent)	6.88%	6.88%
Long-term debt, maturity year	2016	2016
7.5% senior notes, due 2016 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	732.7	732.7
Long-term debt, interest rate (as a percent)	7.50%	7.50%
Long-term debt, maturity year	2016	2016
10% senior notes, due 2016, net [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	500	500
Long-term debt, interest rate (as a percent)	10.00%	10.00%
Long-term debt, maturity year	2016	2016
7.625% senior notes, due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	743	743
Long-term debt, interest rate (as a percent)	7.63%	7.63%
Long-term debt, maturity year	2017	2017
11.375% senior notes, due 2018, net [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	475	475
Long-term debt, interest rate (as a percent)	11.38%	11.38%
Long-term debt, maturity year	2018	2018
8.625% senior notes, due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	850	850
Long-term debt, interest rate (as a percent)	8.63%	8.63%
Long-term debt, maturity year	2019	2019
5.25% senior notes, due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	500	500
Long-term debt, interest rate (as a percent)	5.25%	5.25%
Long-term debt, maturity year	2020	2020
6.75% senior notes, due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	1,000	1,000
Long-term debt, interest rate (as a percent)	6.75%	6.75%
Long-term debt, maturity year	2020	2020
6.625% senior notes, due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	1,250	1,250
Long-term debt, interest rate (as a percent)	6.63%	6.63%
Long-term debt, maturity year	2021	2021
7.75% senior notes, due 2022 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	1,000	1,000
Long-term debt, interest rate (as a percent)	7.75%	7.75%
Long-term debt, maturity year	2022	2022
6% senior notes, due 2023 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	1,250	1,250
Long-term debt, interest rate (as a percent)	6.00%	6.00%
Long-term debt, maturity year	2023	2023
7% debentures, due 2036, net [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	0.6	0.6
Long-term debt, interest rate (as a percent)	7.00%	7.00%
Long-term debt, maturity year	2036	2036
6.7% debentures, due 2096 [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	$4.30	$4.30
Long-term debt, interest rate (as a percent)	6.70%	6.70%
Long-term debt, maturity year	2096	2096

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)	3 Months Ended	1 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Mar. 31, 2015	Apr. 30, 2015	Dec. 31, 2014	Apr. 30, 2010
Debt Instrument [Line Items]
Long-term debt, fair value	15,400,000,000		$15,100,000,000
MGM Grand Paradise credit facility [Member]
Debt Instrument [Line Items]
Long-term debt, maturity date	31-Oct-17
Maximum [Member] | MGM Grand Paradise credit facility [Member] | Debt Covenant Terms Prior to First Anniversary of MGM Cotai Opening [Member]
Debt Instrument [Line Items]
Consolidated leverage ratio	4.5
Maximum [Member] | MGM Grand Paradise credit facility [Member] | Debt Covenant Terms Subsequent to First Anniversary of MGM Cotai Opening [Member]
Debt Instrument [Line Items]
Consolidated leverage ratio	4
Minimum [Member] | MGM Grand Paradise credit facility [Member]
Debt Instrument [Line Items]
Consolidated interest coverage ratio	2.5
Revolving Loans [Member] | MGM Grand Paradise credit facility [Member]
Debt Instrument [Line Items]
Credit facility amount	1,450,000,000
Interest rate at the end of the period (as a percent)	1.99%
Term Loans [Member] | MGM Grand Paradise credit facility [Member]
Debt Instrument [Line Items]
Credit facility amount	550,000,000
Interest rate at the end of the period (as a percent)	1.99%
HIBOR [Member] | MGM Grand Paradise credit facility [Member]
Debt Instrument [Line Items]
Variable interest rate base	HIBOR
Interest rate margin (as a percent)	1.75%
HIBOR [Member] | Maximum [Member] | MGM Grand Paradise credit facility [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)	2.50%
HIBOR [Member] | Minimum [Member] | MGM Grand Paradise credit facility [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)	1.75%
Senior credit facility [Member]
Debt Instrument [Line Items]
Annual capital expenditures after giving effect to unused amounts from prior year	794,000,000
Senior credit facility [Member] | Collateralized land and assets of MGM Grand Detroit [Member] | MGM Grand Detroit, LLC [Member]
Debt Instrument [Line Items]
Debt instrument, collateral amount	450,000,000
Senior credit facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Annual capital expenditures	500,000,000
Senior credit facility [Member] | Maximum [Member] | Collateralized land and assets of MGM Grand Las Vegas, Bellagio and The Mirage [Member]
Debt Instrument [Line Items]
Debt instrument, collateral amount	3,350,000,000
Senior credit facility [Member] | Minimum [Member] | Debt Covenant Terms March Thirty One Two Thousand And Fifteen
Debt Instrument [Line Items]
Trailing annual earnings before interest, taxes, depreciation and amortization (EBITDA)	1,250,000,000
Senior credit facility [Member] | Minimum [Member] | Debt Covenant Terms June Thirty Two Thousand And Fifteen
Debt Instrument [Line Items]
Trailing annual earnings before interest, taxes, depreciation and amortization (EBITDA)	1,250,000,000
Senior credit facility [Member] | Minimum [Member] | Debt Covenant Terms September Thirty Two Thousand And Fifteen
Debt Instrument [Line Items]
Trailing annual earnings before interest, taxes, depreciation and amortization (EBITDA)	1,300,000,000
Senior credit facility [Member] | Minimum [Member] | Debt Covenant Terms December Thirty One Two Thousand And Fifteen
Debt Instrument [Line Items]
Trailing annual earnings before interest, taxes, depreciation and amortization (EBITDA)	1,300,000,000
Senior credit facility [Member] | Minimum [Member] | Debt Covenant Terms March Thirty One Two Thousand And Sixteen
Debt Instrument [Line Items]
Trailing annual earnings before interest, taxes, depreciation and amortization (EBITDA)	1,350,000,000
Senior credit facility [Member] | Minimum [Member] | Debt Covenant Terms Trailing Four Quarters [Member]
Debt Instrument [Line Items]
Trailing annual earnings before interest, taxes, depreciation and amortization (EBITDA)	1,350,000,000
Senior credit facility [Member] | Revolving Loans [Member]
Debt Instrument [Line Items]
Credit facility amount	1,200,000,000
Long-term debt, maturity date	20-Dec-17
Available borrowing capacity	1,100,000,000
Senior credit facility [Member] | Term Loans [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	2,737,000,000		2,744,000,000
Repayments	7,000,000
Senior credit facility [Member] | LIBOR [Member] | Revolving Loans [Member]
Debt Instrument [Line Items]
Variable interest rate base	LIBOR
Interest rate margin (as a percent)	2.75%
Subsequent Event [Member] | Term Loans [Member] | MGM Grand Paradise credit facility [Member]
Debt Instrument [Line Items]
Credit facility amount		1,550,000,000
Subsequent Event [Member] | HIBOR [Member] | MGM Grand Paradise credit facility [Member]
Debt Instrument [Line Items]
Variable interest rate base		HIBOR
Interest rate margin (as a percent)		1.75%
Subsequent Event [Member] | HIBOR [Member] | Maximum [Member] | MGM Grand Paradise credit facility [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)		2.50%
Subsequent Event [Member] | HIBOR [Member] | Minimum [Member] | MGM Grand Paradise credit facility [Member]
Debt Instrument [Line Items]
Interest rate margin (as a percent)		1.38%
4.25% convertible senior notes, due 2015, net [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount	1,450,000,000		1,450,000,000	1,150,000,000
Long-term debt, interest rate (as a percent)	4.25%		4.25%
Initial conversion price of shares (in dollars per share)	18.58
Common stock shares issued	78
Share received upon capped call transactions	6
4.25% convertible senior notes, due 2015, net [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Long-term debt, principal amount		1,450,000,000
Long-term debt, interest rate (as a percent)		4.25%
Conversion ratio, number of shares per $1,000 principal amount, numerator		53.83
Senior credit facility term loan A [Member]
Debt Instrument [Line Items]
Credit facility amount	1,030,000,000
Long-term debt, maturity date	20-Dec-17
Amortization payments of original principal balance (as percent)	0.25%
Interest rate at the end of the period (as a percent)	2.90%
Senior credit facility term loan A [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Variable interest rate base	LIBOR
Senior credit facility term loan B [Member]
Debt Instrument [Line Items]
Credit facility amount	1,710,000,000
Interest rate floor (as a percent)	1.00%
Long-term debt, maturity date	20-Dec-19
Amortization payments of original principal balance (as percent)	0.25%
Interest rate at the end of the period (as a percent)	3.50%
Senior credit facility term loan B [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Variable interest rate base	LIBOR
Interest rate margin (as a percent)	2.50%

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Jan. 09, 2013	Mar. 31, 2015
	Payments	Payments
Senior credit facility [Member]
Loss Contingencies [Line Items]
Letter of credit outstanding		$52
Letters of credit [Member] | Senior credit facility [Member]
Loss Contingencies [Line Items]
Amount that can be issued		500
MGM Resorts International [Member] | Completion guarantee [Member]
Loss Contingencies [Line Items]
Amount funded under completion guarantee		888
MGM Grand Paradise, S.A. [Member] | Cotai land concession contract [Member]
Loss Contingencies [Line Items]
Initial term of contract	25 years
Payable for land concession contract	161
Number of semi-annual payments	8
MGM Grand Paradise, S.A. [Member] | Macau [Member] | Cotai land concession contract [Member]
Loss Contingencies [Line Items]
Area of development site (in acres)		18
MGM China [Member] | Cotai land concession contract [Member]
Loss Contingencies [Line Items]
Payable for land concession contract		59
Number of semi-annual payments		4
Contract premium, recorded within other long-term assets		115
MGM China [Member] | Guarantee Type, Other | Senior credit facility [Member]
Loss Contingencies [Line Items]
Letter of credit outstanding		39
Las Vegas Arena Company, LLC [Member]
Loss Contingencies [Line Items]
Payments to acquire equity method investments		113
Las Vegas Arena Company, LLC [Member] | Maximum [Member] | Anschutz Entertainment Group, Inc [Member]
Loss Contingencies [Line Items]
Other commitment for construction		175
Las Vegas Arena Company, LLC [Member] | Term Loan B Facility [Member]
Loss Contingencies [Line Items]
Repayment guarantee		75
M G M Grand Paradise Senior Credit Facility | Letters of credit [Member] | Senior credit facility [Member] | Standby Letters of Credit
Loss Contingencies [Line Items]
Amount that can be issued		100
MGM Springfield [Member]
Loss Contingencies [Line Items]
Surety bond		$52

Income_Per_Share_of_Common_Sto

Income Per Share of Common Stock - Schedule of Weighted-Average Number of Common and Common Equivalent Shares Used in the Calculation of Basic and Diluted Income Per Share (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net income attributable to MGM Resorts International - basic	$169,850	$102,652
Interest on convertible debt, net of tax	19,967	2,195
Potentially dilutive effect due to MGM China Share Option Plan	-8	-132
Net income attributable to MGM Resorts International - diluted	189,809	104,715
Net income attributable to MGM Resorts International - basic	$169,850	$102,652
Denominator:
Weighted-average common shares outstanding - basic	491,422	490,542
Potential dilution from share-based awards	5,836	6,453
Potential dilution from assumed conversion of convertible debt	78,054	16,149
Weighted-average common and common equivalent shares - diluted	575,312	513,144
Antidilutive share-based awards excluded from the calculation of diluted earnings per share	4,627	2,625

Income_Loss_Per_Share_of_Commo2

Income (Loss) Per Share of Common Stock - Additional Information (Detail) (4.25% convertible senior notes, due 2015, net [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Apr. 30, 2010
Investment Holdings [Line Items]
Share received upon capped call transactions	6
Long-term debt, principal amount	$1,450		$1,450	$1,150
Long-term debt, interest rate (as a percent)	4.25%		4.25%
Convertible Debt Issued June 2011 [Member]
Investment Holdings [Line Items]
Long-term debt, principal amount		300
Long-term debt, interest rate (as a percent)		4.25%
Long-term debt, issuance date		2011-06
Convertible Debt Issued April 2010 [Member]
Investment Holdings [Line Items]
Long-term debt, principal amount		$1,150
Long-term debt, interest rate (as a percent)		4.25%
Long-term debt, issuance date		2010-04

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended		1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Feb. 28, 2015
Stockholders Equity Note [Line Items]
Distributions to noncontrolling interest owners	$202,624,000	$247,140,000
MGM China [Member]
Stockholders Equity Note [Line Items]
Dividend remained within the consolidated entity			204,000,000	254,000,000
Distributions to noncontrolling interest owners			196,000,000	245,000,000
MGM China [Member] | Special Dividend [Member]
Stockholders Equity Note [Line Items]
Dividends paid			400,000,000	499,000,000
MGM China [Member] | Final Dividend [Member]
Stockholders Equity Note [Line Items]
Dividends recommended					$120,000,000

Stockholders_Equity_Changes_in

Stockholders' Equity - Changes in Stockholders' Equity (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Increase (Decrease) in Stockholders' Equity
Balances	$7,628,274
Net income	212,646	186,100
Foreign currency translation adjustment	2,476	-2,760
Other	-672	1,250
Stock-based compensation	10,702
Change in excess tax benefit from stock-based compensation	-2,166
Issuance of common stock pursuant to stock-based compensation awards	-294
Cash distributions to noncontrolling interest owners	-202,803
Issuance of performance share units	4,872
Balances	7,653,035
MGM Resorts Stockholders' Equity [Member]
Increase (Decrease) in Stockholders' Equity
Balances	4,090,917
Net income	169,850
Foreign currency translation adjustment	1,261
Other	-672
Stock-based compensation	9,350
Change in excess tax benefit from stock-based compensation	-2,166
Issuance of common stock pursuant to stock-based compensation awards	-294
Issuance of performance share units	4,872
Balances	4,273,118
Non-controlling Interests [Member]
Increase (Decrease) in Stockholders' Equity
Balances	3,537,357
Net income	42,796
Foreign currency translation adjustment	1,215
Stock-based compensation	1,352
Cash distributions to noncontrolling interest owners	-202,803
Balances	$3,379,917

Stockholders_Equity_Schedule_o

Stockholders' Equity - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) Attributable to MGM Resorts International by Component (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Balances, beginning of the period	$12,991
Current period other comprehensive income (loss)	589
Balances, end of the period	13,580
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balances, beginning of the period	12,319
Current period other comprehensive income (loss)	1,261
Balances, end of the period	13,580
Other Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balances, beginning of the period	672
Current period other comprehensive income (loss)	($672)

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail)	Mar. 31, 2015
In Millions, unless otherwise specified
Omnibus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant as share-based awards	23
China Share Option Plan | Stock Options [Member] | MGM China [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for grant as share-based awards	338

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Stock Options and Stock Appreciation Rights Activity (Detail) (Omnibus Plan [Member], USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
Omnibus Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding at the beginning of the period (in shares)	16,176
Granted (in shares)	12
Exercised (in shares)	-163
Forfeited or expired (in shares)	-856
Outstanding at the end of the period (in shares)	15,169
Exercisable at the end of the period (in shares)	9,824
Outstanding at the beginning of the period (in dollars per share)	$15.27
Granted (in dollars per share)	$20.03
Exercised (in dollars per share)	$14.10
Forfeited or expired (in dollars per share)	$35.27
Outstanding at the end of the period (in dollars per share)	$14.20
Exercisable at the end of the period (in dollars per share)	$12.34

StockBased_Compensation_Schedu

Stock-Based Compensation - Schedule of Restricted Stock Units and Performance Share Units Activity (Detail) (Omnibus Plan [Member], USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Nonvested at the beginning of the period (in shares)	1,358
Forfeited (in shares)	-15
Nonvested at the end of the period (in shares)	1,343
Nonvested at the beginning of the period (in dollars per share)	$18.27
Forfeited (in dollars per share)	$18.08
Nonvested at the end of the period (in dollars per share)	$18.27
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Nonvested at the beginning of the period (in shares)		1,455
Nonvested at the end of the period (in shares)	1,455	1,455
Nonvested at the beginning of the period (in dollars per share)		$15.14
Nonvested at the end of the period (in dollars per share)	$15.14	$15.14
Nonvested at the beginning of period, Weighted Average Target Price (in dollars per share)		$20.48
Nonvested at the end of period, Weighted Average Target Price (in dollars per share)	$20.48	$20.48

StockBased_Compensation_Summar1

Stock-Based Compensation - Summary of Bonus Performance Share Units Activity (Detail) (Omnibus Plan [Member], Bonus PSUs [Member], USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
Omnibus Plan [Member] | Bonus PSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Nonvested at the beginning of the period (in shares)	265
Granted (in shares)	229
Nonvested at the end of the period (in shares)	494
Outstanding at the beginning of period, Weighted Average Target Price (in dollars per share)	$31.72
Granted, Weighted Average Target Price (in dollars per share)	$25.91
Outstanding at the end of period, Weighted Average Target Price (in dollars per share)	$29.03

StockBased_Compensation_Summar2

Stock-Based Compensation - Summary of Stock Options Activity (Detail) (MGM China Plan [Member], USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015
MGM China Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding at the beginning of the period (in shares)	35,058
Granted (in shares)	710
Outstanding at the end of the period (in shares)	35,768
Exercisable at the end of the period (in shares)	10,642
Outstanding at the beginning of the period (in dollars per share)	$2.85
Granted (in dollars per share)	$2.48
Outstanding at the end of the period (in dollars per share)	$2.84
Exercisable at the end of the period (in dollars per share)	$2.05

StockBased_Compensation_Schedu1

Stock-Based Compensation - Schedule of Compensation Cost Recognized (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation cost	$10,702	$8,463
Less: Reimbursed costs and capitalized cost	-290	-268
Compensation cost after reimbursed costs and capitalized cost	10,412	8,195
Less: Related tax benefit	-2,634	-2,317
Compensation cost, net of tax benefit	7,778	5,878
Omnibus Plan [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation cost	7,942	7,002
MGM China Plan [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Compensation cost	$2,760	$1,461

Segment_Information_Additional

Segment Information - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015
	Segment
	Region
Segment Reporting [Abstract]
Number of geographic regions, where principal operating activities of the entity occur	2
Number of reportable segments	2

Segment_Information_Schedule_o

Segment Information - Schedule of Segment Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Net Revenues	$2,332,244	$2,630,398
Other operating income (expense)
Preopening and start-up expenses	-15,871	-5,636
Property transactions, net	-1,589	-558
Depreciation and amortization	-206,412	-207,655
Operating income	395,104	416,472
Non-operating income (expense)
Interest expense, net of amounts capitalized	-216,262	-209,387
Non-operating items from unconsolidated affiliates	-19,011	-22,215
Other, net	-3,490	-1,434
Total non-operating income (expense)	-238,763	-233,036
Income before income taxes	156,341	183,436
Benefit for income taxes	56,305	2,664
Net income	212,646	186,100
Less: Net income attributable to noncontrolling interests	-42,796	-83,448
Net income attributable to MGM Resorts International	169,850	102,652
Reportable segments [Member]
Segment Reporting Information [Line Items]
Net Revenues	2,207,982	2,511,682
Adjusted Property EBITDA	538,335	643,571
Reportable segments [Member] | Wholly Owned Domestic Resorts [Member]
Segment Reporting Information [Line Items]
Net Revenues	1,577,895	1,570,234
Adjusted Property EBITDA	389,879	402,846
Reportable segments [Member] | MGM China [Member]
Segment Reporting Information [Line Items]
Net Revenues	630,087	941,448
Adjusted Property EBITDA	148,456	240,725
Corporate and other [Member]
Segment Reporting Information [Line Items]
Net Revenues	124,262	118,716
Other operating income (expense)
Corporate and other, net	$80,641	($13,250)

Related_Party_Transactions_Add

Related Party Transactions - Additional Information (Detail) (MGM China [Member], Ms Pansy Ho, USD $)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Brand license agreement [Member]
Related Party Transaction [Line Items]
License fee as percentage of MGM China consolidated net revenue	1.75%
Per annum percentage increase in development fee annual cap	20.00%
License fees	$11	$16
Brand license agreement [Member] | Scenario, Forecast [Member] | Maximum [Member]
Related Party Transaction [Line Items]
License fee cap	52
Development services agreement [Member]
Related Party Transaction [Line Items]
Per annum percentage increase in development fee annual cap	10.00%
Development fee as percentage of project cost	2.63%
Development fees	10	0
Development services agreement [Member] | Scenario, Forecast [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Development fees	$27

Condensed_Consolidating_Financ2

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Balance Sheet Information (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Condensed Balance Sheet Statements Captions [Line Items]
Current assets	$2,956,607	$3,027,160
Property and equipment, net	14,561,951	14,441,542
Investments in and advances to unconsolidated affiliates	1,661,444	1,559,034
Other non-current assets	7,618,445	7,674,775
Total assets	26,798,447	26,702,511
Current liabilities	1,895,761	3,407,925
Deferred income taxes, net	2,547,150	2,621,860
Long-term debt	14,551,810	12,913,882
Other long-term obligations	150,691	130,570
Total liabilities	19,145,412	19,074,237
MGM Resorts stockholders' equity	4,273,118	4,090,917
Noncontrolling interests	3,379,917	3,537,357
Total stockholders' equity	7,653,035	7,628,274
Total liabilities and stockholders' equity	26,798,447	26,702,511
Parent [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Current assets	1,206,649	1,390,806
Investments in subsidiaries	20,727,345	20,430,160
Other non-current assets	134,077	141,035
Total assets	22,068,071	21,962,001
Current liabilities	270,376	1,680,319
Intercompany accounts	2,103,314	1,932,780
Deferred income taxes, net	2,238,007	2,312,828
Long-term debt	13,145,313	11,907,534
Other long-term obligations	37,943	37,623
Total liabilities	17,794,953	17,871,084
MGM Resorts stockholders' equity	4,273,118	4,090,917
Total stockholders' equity	4,273,118	4,090,917
Total liabilities and stockholders' equity	22,068,071	21,962,001
Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Current assets	861,068	868,688
Property and equipment, net	12,425,331	12,445,086
Investments in subsidiaries	3,916,769	3,896,365
Investments in and advances to unconsolidated affiliates	1,628,720	1,526,446
Intercompany accounts	2,389,327	2,175,091
Other non-current assets	429,070	414,801
Total assets	21,650,285	21,326,477
Current liabilities	958,446	953,179
Long-term debt	4,837	4,837
Other long-term obligations	70,525	58,016
Total liabilities	1,033,808	1,016,032
MGM Resorts stockholders' equity	20,616,477	20,310,445
Total stockholders' equity	20,616,477	20,310,445
Total liabilities and stockholders' equity	21,650,285	21,326,477
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Current assets	889,268	768,335
Property and equipment, net	2,148,592	2,008,428
Investments in and advances to unconsolidated affiliates	7,724	7,588
Other non-current assets	7,055,298	7,118,939
Total assets	10,100,882	9,903,290
Current liabilities	667,317	775,097
Intercompany accounts	286,013	242,311
Deferred income taxes, net	309,143	309,032
Long-term debt	1,401,660	1,001,511
Other long-term obligations	42,223	34,931
Total liabilities	2,706,356	2,362,882
MGM Resorts stockholders' equity	4,014,609	4,003,051
Noncontrolling interests	3,379,917	3,537,357
Total stockholders' equity	7,394,526	7,540,408
Total liabilities and stockholders' equity	10,100,882	9,903,290
Elimination [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Current assets	-378	-669
Property and equipment, net	-11,972	-11,972
Investments in subsidiaries	-24,644,114	-24,326,525
Investments in and advances to unconsolidated affiliates	25,000	25,000
Intercompany accounts	-2,389,327	-2,175,091
Total assets	-27,020,791	-26,489,257
Current liabilities	-378	-670
Intercompany accounts	-2,389,327	-2,175,091
Total liabilities	-2,389,705	-2,175,761
MGM Resorts stockholders' equity	-24,631,086	-24,313,496
Total stockholders' equity	-24,631,086	-24,313,496
Total liabilities and stockholders' equity	($27,020,791)	($26,489,257)

Condensed_Consolidating_Financ3

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Operations and Comprehensive Income Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Condensed Income Statements Captions [Line Items]
Net Revenues	$2,332,244	$2,630,398
Expenses
Casino and hotel operations	1,452,120	1,650,095
General and administrative	328,173	319,246
Corporate expense	50,356	53,351
Preopening and start-up expenses	15,871	5,636
Property transactions, net	1,589	558
Depreciation and amortization	206,412	207,655
Total expenses	2,054,521	2,236,541
Income from unconsolidated affiliates	117,381	22,615
Operating income (loss)	395,104	416,472
Interest expense, net of amounts capitalized	-216,262	-209,387
Other, net	-22,501	-23,649
Income before income taxes	156,341	183,436
Benefit for income taxes	56,305	2,664
Net income	212,646	186,100
Less: Net income attributable to noncontrolling interests	-42,796	-83,448
Net income attributable to MGM Resorts International	169,850	102,652
Net income (loss)	212,646	186,100
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	2,476	-2,760
Other	-672	1,250
Other comprehensive income (loss)	1,804	-1,510
Comprehensive income	214,450	184,590
Less: Comprehensive income attributable to noncontrolling interests	-44,011	-82,205
Comprehensive income attributable to MGM Resorts International	170,439	102,385
Elimination [Member]
Condensed Income Statements Captions [Line Items]
Net Revenues	-723	-593
Equity in subsidiaries' earnings	-372,732	-395,687
Expenses
Casino and hotel operations	-723	-593
Total expenses	-723	-593
Operating income (loss)	-372,732	-395,687
Income before income taxes	-372,732	-395,687
Net income	-372,732	-395,687
Net income attributable to MGM Resorts International	-372,732	-395,687
Net income (loss)	-372,732	-395,687
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	-2,522	3,034
Other	672	-1,250
Other comprehensive income (loss)	-1,850	1,784
Comprehensive income	-374,582	-393,903
Comprehensive income attributable to MGM Resorts International	-374,582	-393,903
Parent [Member]
Condensed Income Statements Captions [Line Items]
Equity in subsidiaries' earnings	327,766	302,318
Expenses
Casino and hotel operations	1,500	1,254
General and administrative	1,201	1,112
Corporate expense	15,516	16,739
Total expenses	18,217	19,105
Operating income (loss)	309,549	283,213
Interest expense, net of amounts capitalized	-211,077	-200,897
Other, net	12,879	18,590
Income before income taxes	111,351	100,906
Benefit for income taxes	58,499	1,746
Net income	169,850	102,652
Net income attributable to MGM Resorts International	169,850	102,652
Net income (loss)	169,850	102,652
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	1,261	-1,517
Other	-672	1,250
Other comprehensive income (loss)	589	-267
Comprehensive income	170,439	102,385
Comprehensive income attributable to MGM Resorts International	170,439	102,385
Guarantor Subsidiaries [Member]
Condensed Income Statements Captions [Line Items]
Net Revenues	1,569,282	1,556,329
Equity in subsidiaries' earnings	44,966	93,369
Expenses
Casino and hotel operations	937,439	921,974
General and administrative	269,554	260,640
Corporate expense	35,204	33,586
Preopening and start-up expenses	917	1,991
Property transactions, net	1,257	494
Depreciation and amortization	127,818	128,075
Total expenses	1,372,189	1,346,760
Income from unconsolidated affiliates	117,265	22,562
Operating income (loss)	359,324	325,500
Interest expense, net of amounts capitalized	-288	-104
Other, net	-20,738	-22,855
Income before income taxes	338,298	302,541
Benefit for income taxes	-1,686	1,641
Net income	336,612	304,182
Net income attributable to MGM Resorts International	336,612	304,182
Net income (loss)	336,612	304,182
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	1,261	-1,517
Other	-672	1,250
Other comprehensive income (loss)	589	-267
Comprehensive income	337,201	303,915
Comprehensive income attributable to MGM Resorts International	337,201	303,915
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements Captions [Line Items]
Net Revenues	763,685	1,074,662
Expenses
Casino and hotel operations	513,904	727,460
General and administrative	57,418	57,494
Corporate expense	-364	3,026
Preopening and start-up expenses	14,954	3,645
Property transactions, net	332	64
Depreciation and amortization	78,594	79,580
Total expenses	664,838	871,269
Income from unconsolidated affiliates	116	53
Operating income (loss)	98,963	203,446
Interest expense, net of amounts capitalized	-4,897	-8,386
Other, net	-14,642	-19,384
Income before income taxes	79,424	175,676
Benefit for income taxes	-508	-723
Net income	78,916	174,953
Less: Net income attributable to noncontrolling interests	-42,796	-83,448
Net income attributable to MGM Resorts International	36,120	91,505
Net income (loss)	78,916	174,953
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment	2,476	-2,760
Other comprehensive income (loss)	2,476	-2,760
Comprehensive income	81,392	172,193
Less: Comprehensive income attributable to noncontrolling interests	-44,011	-82,205
Comprehensive income attributable to MGM Resorts International	$37,381	$89,988

Condensed_Consolidating_Financ4

Condensed Consolidating Financial Information - Schedule of Condensed Consolidating Statement of Cash Flows Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net cash provided by (used in) operating activities	$175,648	$290,795
Cash flows from investing activities
Capital expenditures, net of construction payable	-292,329	-192,751
Dispositions of property and equipment	164	135
Investments in and advances to unconsolidated affiliates	-160,079	-32,175
Distributions from unconsolidated affiliates in excess of earnings	1,111	497
Investments in treasury securities - maturities longer than 90 days		-54,064
Proceeds from treasury securities - maturities longer than 90 days		63,063
Cash deposits - original maturities longer than 90 days	570,000
Other	-2,070	1,226
Net cash provided by (used in) investing activities	116,797	-214,069
Cash flows from financing activities
Net repayments under bank credit facilities b maturities of 90 days or less	-1,318,626	-1,735,125
Borrowings under bank credit facilities b maturities longer than 90 days	1,710,625	1,728,125
Retirement of senior notes		-508,900
Distributions to noncontrolling interest owners	-202,624	-247,140
Other	-152	-1,648
Net cash provided by (used in) financing activities	189,223	-764,688
Effect of exchange rate on cash	704	-971
Cash and cash equivalents
Net increase (decrease) for the period	482,372	-688,933
Change in cash related to assets held for sale	-552
Balance, beginning of period	1,713,715	1,803,669
Balance, end of period	2,195,535	1,114,736
Elimination [Member]
Cash flows from operating activities
Net cash provided by (used in) operating activities		25,000
Cash flows from investing activities
Investments in and advances to unconsolidated affiliates		-25,000
Intercompany accounts	214,237	248,319
Net cash provided by (used in) investing activities	214,237	223,319
Cash flows from financing activities
Intercompany accounts	-214,237	-248,319
Net cash provided by (used in) financing activities	-214,237	-248,319
Parent [Member]
Cash flows from operating activities
Net cash provided by (used in) operating activities	-217,074	-186,046
Cash flows from investing activities
Investments in and advances to unconsolidated affiliates	-140,732	-5,200
Cash deposits - original maturities longer than 90 days	570,000
Net cash provided by (used in) investing activities	429,268	-5,200
Cash flows from financing activities
Net repayments under bank credit facilities b maturities of 90 days or less	-1,267,625	-1,285,125
Borrowings under bank credit facilities b maturities longer than 90 days	1,260,625	1,278,125
Retirement of senior notes		-508,900
Intercompany accounts	187,337	515,595
Other	-152	-1,202
Net cash provided by (used in) financing activities	180,185	-1,507
Cash and cash equivalents
Net increase (decrease) for the period	392,379	-192,753
Balance, beginning of period	799,508	378,660
Balance, end of period	1,191,887	185,907
Guarantor Subsidiaries [Member]
Cash flows from operating activities
Net cash provided by (used in) operating activities	293,772	301,590
Cash flows from investing activities
Capital expenditures, net of construction payable	-105,509	-69,530
Dispositions of property and equipment	100	69
Investments in and advances to unconsolidated affiliates	-19,347	-1,975
Distributions from unconsolidated affiliates in excess of earnings	1,111	497
Investments in treasury securities - maturities longer than 90 days		-54,064
Proceeds from treasury securities - maturities longer than 90 days		63,063
Intercompany accounts	-214,237	-248,319
Other	-2,070	1,226
Net cash provided by (used in) investing activities	-339,952	-309,033
Cash flows from financing activities
Intercompany accounts	10,520	-9,057
Other	-2
Net cash provided by (used in) financing activities	10,518	-9,057
Cash and cash equivalents
Net increase (decrease) for the period	-35,662	-16,500
Change in cash related to assets held for sale	-552
Balance, beginning of period	255,655	237,457
Balance, end of period	219,441	220,957
Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities
Net cash provided by (used in) operating activities	98,950	150,251
Cash flows from investing activities
Capital expenditures, net of construction payable	-186,820	-123,221
Dispositions of property and equipment	64	66
Net cash provided by (used in) investing activities	-186,756	-123,155
Cash flows from financing activities
Net repayments under bank credit facilities b maturities of 90 days or less	-51,001	-450,000
Borrowings under bank credit facilities b maturities longer than 90 days	450,000	450,000
Intercompany accounts	16,380	-258,219
Distributions to noncontrolling interest owners	-202,624	-247,140
Other	2	-446
Net cash provided by (used in) financing activities	212,757	-505,805
Effect of exchange rate on cash	704	-971
Cash and cash equivalents
Net increase (decrease) for the period	125,655	-479,680
Balance, beginning of period	658,552	1,187,552
Balance, end of period	$784,207	$707,872