| Cover | Sep. 22, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 22, 2021 |
| Current Fiscal Year End Date | --12-31 |
| Entity File Number | 001-32384 |
| Entity Registrant Name | MACQUARIE INFRASTRUCTURE CORPORATION |
| Entity Central Index Key | 0001289790 |
| Entity Tax Identification Number | 43-2052503 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 125 West 55th Street |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10019 |
| City Area Code | 212 |
| Local Phone Number | 231-1000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | N/A |
| Trading Symbol | N/A |
| Security Exchange Name | NONE |
| Entity Emerging Growth Company | false |
