| Cover Page | Nov. 17, 2020 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Entity Registrant Name | MGM Growth Properties LLC |
| Entity Central Index Key | 0001656936 |
| Document Period End Date | Nov. 17, 2020 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-37733 |
| Entity Tax Identification Number | 47-5513237 |
| Entity Address, Address Line One | 1980 Festival Plaza Drive, 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 Emerging Growth Company | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| MGM Growth Properties [Member] | |
| Entity Information [Line Items] | |
| Entity Registrant Name | MGM Growth Properties Operating Partnership LP |
| Entity Central Index Key | 0001691299 |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 333-215571 |
| Entity Tax Identification Number | 81-1162318 |
