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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 21, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-32384    
Entity Registrant Name MACQUARIE INFRASTRUCTURE CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 43-2052503    
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    
Title of 12(b) Security Common stock, par value $0.001 per share    
Trading Symbol MIC    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 2,219,548,841
Entity Common Stock, Shares Outstanding   86,742,424  
Documents Incorporated by Reference
The definitive proxy statement relating to Macquarie Infrastructure Corporation’s Annual Meeting of Stockholders for fiscal year ended December 31, 2019, to be held May 14, 2020 is incorporated by reference in Part III to the extent described therein.
    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001289790    
Current Fiscal Year End Date --12-31