Cover Page - USD ($) $ in Billions	12 Months Ended
Cover Page - USD ($) $ in Billions	Dec. 31, 2021	Feb. 14, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K/A
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Document Transition Report	false
Entity File Number	001-37733
Entity Registrant Name	MGM Growth Properties LLC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-5513237
Entity Address, Address Line One	1980 Festival Plaza Drive
Entity Address, Address Line Two	Suite 750
Entity Address, City or Town	Las Vegas
Entity Address, State or Province	NV
Entity Address, Postal Zip Code	89135
City Area Code	702
Local Phone Number	669-1480
Title of 12(b) Security	Class A Shares, no par value
Trading Symbol	MGP
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntarily Files	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth	false
Public Float			$ 5.7
Entity Common Stock, Shares Outstanding		156,753,272
ICFR Auditor Attestation Flag	true
Documents Incorporated by Reference	None.
Amendment Flag	true
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Entity Central Index Key	0001656936
Current Fiscal Year End Date	--12-31
Entity Shell Company	false
Amendment Description	This Amendment No. 1 on Form 10-K/A (the “Amendment”) amends the Annual Report on Form 10-K (the “Form 10-K”) of MGM Growth Properties LLC (the “Company”) and MGM Growth Properties Operating Partnership LP (the “Operating Partnership”) for the fiscal year ended December 31, 2021 (the “2021 Fiscal Year”), as filed with the Securities and Exchange Commission (the “SEC”) on February 16, 2022. The Company is filing this Amendment to amend Part III of the Form 10-K to include the information required by and not included in Part III of the Form 10-K because the Company does not intend to file its definitive proxy statement within 120 days of the end of the 2021 Fiscal Year. Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended, this Amendment also contains new certifications by the principal executive officer and the principal financial officer as required by Section 302 of the Sarbanes-Oxley Act of 2002. Accordingly, Item 15(a)(3) of Part IV is amended to include the currently dated certifications as exhibits. Because no financial statements have been included in this Amendment and this Amendment does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4 and 5 of the certifications have been omitted. Except as described above, no other changes have been made to the Form 10-K. The Form 10-K continues to speak as of the date of the Form 10-K, and we have not updated the disclosures contained therein to reflect any events which occurred at a date subsequent to the filing of the Form 10-K other than as expressly indicated in this Amendment.
Auditor Name	Deloitte & Touche LLP
Auditor Firm ID	34
Auditor Location	Las Vegas, Nevada
MGP Operating Partnership
Document Information [Line Items]
Entity File Number	333-215571
Entity Registrant Name	MGM Growth Properties Operating Partnership LP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-1162318
Entity Well-known Seasoned Issuer	No
Entity Voluntarily Files	Yes
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth	false
ICFR Auditor Attestation Flag	false
Entity Central Index Key	0001691299
Entity Shell Company	false

MGM Growth Properties LLC 10-K/A