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Related Party Transactions (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 5 Months Ended 12 Months Ended
Nov. 01, 2018
May 31, 2018
Jan. 31, 2018
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 03, 2018
Dec. 31, 2014
Jul. 31, 2014
Related Party Transaction [Line Items]                                            
Number of shares bought by Manager related party (in shares)                               5,987,100            
Percentage of shares held by Manager related party       15.30%                         15.30%          
Base management fees to be settled/settled in shares       $ 9,000,000 $ 8,000,000 $ 7,000,000 $ 8,000,000 $ 9,000,000 $ 12,000,000 $ 11,000,000 $ 13,000,000 $ 17,000,000 $ 18,000,000 $ 18,000,000 $ 18,000,000              
Performance fees to be settled/settled in shares and cash       0 $ 0 $ 0 $ 0 0 $ 0 $ 0 $ 0 0 $ 0 $ 0 $ 0   $ 0          
Percentage of cap on equity market capitalization on base management fee 1.00%                                          
Number of shares issued subsequent for base management fees to manager subsequent to balance sheet date (in shares)                                 70,954          
MIC Corporate                                            
Related Party Transaction [Line Items]                                            
Percentage of future earnings   20.00%                                        
Minimum threshold for sale to third party   50.00%                                        
MIC Corporate | Revolving Credit Facility                                            
Related Party Transaction [Line Items]                                            
Borrowing capacity       $ 600,000,000       $ 600,000,000       $ 410,000,000         $ 600,000,000 $ 600,000,000 $ 410,000,000 $ 600,000,000 $ 410,000,000 $ 250,000,000
At the Market                                            
Related Party Transaction [Line Items]                                            
Borrowing capacity     $ 40,000,000                                      
Macquarie Infrastructure Management (USA) Inc.                                            
Related Party Transaction [Line Items]                                            
Shares of the Company held by Manager, a related party (in shares)       13,253,791       12,477,438                 13,253,791 12,477,438        
Base management fees to be settled/settled in shares                                 $ 32,000,000 $ 45,000,000 71,000,000      
Number of shares issued to manager for base management fees (in shares)       208,881                                    
Reimbursement of out-of-pocket expenses                                 1,000,000 1,000,000 1,000,000      
Accrued professional fees       $ 294,000                         294,000          
MIHI LLC                                            
Related Party Transaction [Line Items]                                            
Borrowing capacity               $ 50,000,000                   50,000,000        
MIHI LLC | MIC Corporate | Revolving Credit Facility                                            
Related Party Transaction [Line Items]                                            
Interest costs incurred                                   285,000        
Macquarie Capital Funding Llc                                            
Related Party Transaction [Line Items]                                            
Payment for debt extinguishment or debt prepayment cost     $ 80,000                                      
Macquarie Capital Funding Llc | Revolving Credit Facility                                            
Related Party Transaction [Line Items]                                            
Interest costs incurred                                 155,000 $ 454,000        
Macquarie Infrastructure And Real Assets Inc                                            
Related Party Transaction [Line Items]                                            
Proceeds from sale of equity interest to related party   $ 27,000,000                                        
Macquarie Energy North America Trading | IMTT                                            
Related Party Transaction [Line Items]                                            
Revenue from related party                                 2,000,000   $ 1,000,000      
Former Board Of Director | Advisory Services                                            
Related Party Transaction [Line Items]                                            
Reimbursement of out-of-pocket expenses                                 $ 125,000