Business	6 Months Ended
Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BUSINESS	BUSINESS Organization. MGM Growth Properties LLC (“MGP” or the “Company”) is a limited liability company that was organized in Delaware on October 23, 2015. MGP conducts its operations through MGM Growth Properties Operating Partnership LP (the “Operating Partnership”), a Delaware limited partnership that was formed on January 6, 2016 and acquired by MGP on April 25, 2016. The Company has elected to be treated as a real estate investment trust ("REIT") commencing with its taxable year ended December 31, 2016. MGP is a publicly traded REIT engaged through its investment in the Operating Partnership in the real property business, which primarily consists of owning, acquiring and leasing large-scale destination entertainment and leisure resorts, whose tenants generally offer casino gaming, hotel, convention, dining, entertainment and retail. MGM Resorts International (“MGM” or the “Parent”) is a Delaware corporation that acts largely as a holding company and, through its subsidiaries, owns and operates large-scale destination entertainment and leisure resorts. Pursuant to a master lease agreement (the “Master Lease”), a subsidiary of the Operating Partnership (the “Landlord”) leases the real estate assets of The Mirage, Mandalay Bay, Luxor, New York-New York, Park MGM (which had previously been branded as Monte Carlo prior to May 2018), Excalibur, The Park, Gold Strike Tunica, MGM Grand Detroit, Beau Rivage, Borgata, and MGM National Harbor back to a subsidiary of MGM (the “Tenant”). As of June 30, 2018, there were 266,045,289 Operating Partnership units outstanding in the Operating Partnership of which MGM owned 195,134,123 or 73.3% and MGP owns the remaining 26.7%. MGM’s Operating Partnership units are exchangeable into Class A shares of MGP on a one-to-one basis, or cash at the fair value of a Class A share. The determination of settlement method is at the option of MGP’s independent conflicts committee. MGM’s indirect ownership of these Operating Partnership units is recognized as a noncontrolling interest in MGP’s financial statements. A wholly owned subsidiary of MGP is the general partner of the Operating Partnership and operates and controls all of its business affairs. As a result, MGP consolidates the Operating Partnership and its subsidiaries. MGM also has ownership of MGP’s outstanding Class B share. The Class B share is a non-economic interest in MGP which does not provide its holder any rights to profits or losses or any rights to receive distributions from the operations of MGP or upon liquidation or winding up of MGP but which represents a majority of the voting power of MGP’s shares. As a result, MGP continues to be controlled by MGM through its majority voting rights, and is consolidated by MGM. On May 28, 2018, the Company entered into an agreement to acquire the real property associated with the Empire City Casino's race track and casino (“Empire City”) from MGM upon its acquisition of Empire City for total consideration of $625 million, which will include the assumption of approximately $245 million of debt by the Operating Partnership with the balance through the issuance of operating partnership units to MGM. Empire City will be added to the existing Master Lease between MGM and MGP. As a result, the annual rent payment to MGP will increase by $50 million. Consistent with the Master Lease terms, 90% of this rent will be fixed and contractually grow at 2% per year until 2022. In addition, pursuant to the Master Lease, MGP will have a right of first offer with respect to certain undeveloped land adjacent to the property to the extent MGM develops additional gaming facilities and chooses to sell or transfer the property in the future. The transactions are expected to close in the first quarter of 2019, subject to regulatory approvals and other customary closing conditions. On April 4, 2018, the Company entered into an agreement with Milstein Entertainment LLC to acquire the membership interests of Northfield Park Associates, LLC, an Ohio limited liability company that owns the real estate assets and operations of the Hard Rock Northfield Park ("Rocksino") for approximately $1.06 billion and on July 6, 2018, one of the Company's taxable REIT subsidiaries (“TRS”) completed the acquisition of the Rocksino. The Company funded the acquisition through a $200 million draw on the delayed draw Term Loan A and a $655 million draw under the revolving credit facility, with the remainder of the purchase price paid with cash on hand. Simultaneously with the close, the Company entered into a new agreement with Hard Rock to continue to serve as the manager of the property. The TRS was formed to engage in activities resulting in income that is not qualifying income for the REIT and will accordingly pay U.S. federal, state and local income tax at regular corporate rates on its taxable income.

BUSINESS

Organization. MGM Growth Properties LLC (“MGP” or the “Company”) is a limited liability company that was organized in Delaware on October 23, 2015. MGP conducts its operations through MGM Growth Properties Operating Partnership LP (the “Operating Partnership”), a Delaware limited partnership that was formed on January 6, 2016 and acquired by MGP on April 25, 2016. The Company has elected to be treated as a real estate investment trust ("REIT") commencing with its taxable year ended December 31, 2016.

MGP is a publicly traded REIT engaged through its investment in the Operating Partnership in the real property business, which primarily consists of owning, acquiring and leasing large-scale destination entertainment and leisure resorts, whose tenants generally offer casino gaming, hotel, convention, dining, entertainment and retail. MGM Resorts International (“MGM” or the “Parent”) is a Delaware corporation that acts largely as a holding company and, through its subsidiaries, owns and operates large-scale destination entertainment and leisure resorts. Pursuant to a master lease agreement (the “Master Lease”), a subsidiary of the Operating Partnership (the “Landlord”) leases the real estate assets of The Mirage, Mandalay Bay, Luxor, New York-New York, Park MGM (which had previously been branded as Monte Carlo prior to May 2018), Excalibur, The Park, Gold Strike Tunica, MGM Grand Detroit, Beau Rivage, Borgata, and MGM National Harbor back to a subsidiary of MGM (the “Tenant”).

As of June 30, 2018, there were 266,045,289 Operating Partnership units outstanding in the Operating Partnership of which MGM owned 195,134,123 or 73.3% and MGP owns the remaining 26.7%. MGM’s Operating Partnership units are exchangeable into Class A shares of MGP on a one-to-one basis, or cash at the fair value of a Class A share. The determination of settlement method is at the option of MGP’s independent conflicts committee. MGM’s indirect ownership of these Operating Partnership units is recognized as a noncontrolling interest in MGP’s financial statements. A wholly owned subsidiary of MGP is the general partner of the Operating Partnership and operates and controls all of its business affairs. As a result, MGP consolidates the Operating Partnership and its subsidiaries. MGM also has ownership of MGP’s outstanding Class B share. The Class B share is a non-economic interest in MGP which does not provide its holder any rights to profits or losses or any rights to receive distributions from the operations of MGP or upon liquidation or winding up of MGP but which represents a majority of the voting power of MGP’s shares. As a result, MGP continues to be controlled by MGM through its majority voting rights, and is consolidated by MGM.

On May 28, 2018, the Company entered into an agreement to acquire the real property associated with the Empire City Casino's race track and casino (“Empire City”) from MGM upon its acquisition of Empire City for total consideration of $625 million, which will include the assumption of approximately $245 million of debt by the Operating Partnership with the balance through the issuance of operating partnership units to MGM. Empire City will be added to the existing Master Lease between MGM and MGP. As a result, the annual rent payment to MGP will increase by $50 million. Consistent with the Master Lease terms, 90% of this rent will be fixed and contractually grow at 2% per year until 2022. In addition, pursuant to the Master Lease, MGP will have a right of first offer with respect to certain undeveloped land adjacent to the property to the extent MGM develops additional gaming facilities and chooses to sell or transfer the property in the future. The transactions are expected to close in the first quarter of 2019, subject to regulatory approvals and other customary closing conditions.

On April 4, 2018, the Company entered into an agreement with Milstein Entertainment LLC to acquire the membership interests of Northfield Park Associates, LLC, an Ohio limited liability company that owns the real estate assets and operations of the Hard Rock Northfield Park ("Rocksino") for approximately $1.06 billion and on July 6, 2018, one of the Company's taxable REIT subsidiaries (“TRS”) completed the acquisition of the Rocksino. The Company funded the acquisition through a $200 million draw on the delayed draw Term Loan A and a $655 million draw under the revolving credit facility, with the remainder of the purchase price paid with cash on hand. Simultaneously with the close, the Company entered into a new agreement with Hard Rock to continue to serve as the manager of the property. The TRS was formed to engage in activities resulting in income that is not qualifying income for the REIT and will accordingly pay U.S. federal, state and local income tax at regular corporate rates on its taxable income.