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Equity and Distributions, Issuances of Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Aug. 03, 2015
Net Cash Proceeds from Sale of Common Units [Abstract]          
Net cash proceeds from the issuance of common units   $ 944,100 $ 223,300    
Oiltanking Partners L.P. [Member]          
Completion of Oiltanking acquisition          
Limited partner interests acquired (in hundredths)       65.90%  
Oiltanking Acquisition [Member]          
Completion of Oiltanking acquisition          
Total consideration for acquisition   $ 5,900,000      
Oiltanking Partners L.P. - Step 1 [Member]          
Completion of Oiltanking acquisition          
Total consideration for acquisition       $ 4,410,000  
Oiltanking Partners L.P. - Step 2 [Member]          
Completion of Oiltanking acquisition          
Common units exchanged for each Oiltanking unit (in units)   1.3      
Common units issued in connection with acquisition of Oiltanking (in units)   36,827,517      
Distribution Reinvestment Plan [Member]          
Registration Statements and Equity Offerings [Line Items]          
Maximum common units authorized for issuance (in units)   140,000,000      
Remaining units available for issuance (in units)   22,027,808      
Net Cash Proceeds from Sale of Common Units [Abstract]          
Number of common units issued (in units)   5,453,541 4,890,878    
Net cash proceeds from the issuance of common units   $ 177,800 $ 160,400    
Distribution Reinvestment Plan [Member] | EPCO and affiliates [Member]          
Net Cash Proceeds from Sale of Common Units [Abstract]          
Net cash proceeds from the issuance of common units   $ 50,000 $ 50,000    
Employee Unit Purchase Plan [Member]          
Registration Statements and Equity Offerings [Line Items]          
Maximum common units authorized for issuance (in units)   8,000,000      
Remaining units available for issuance (in units)   6,969,334      
Net Cash Proceeds from Sale of Common Units [Abstract]          
Number of common units issued (in units)   183,734 149,060    
Net cash proceeds from the issuance of common units   $ 6,300 $ 5,200    
2015 At-the-Market Registration [Member]          
Registration Statements and Equity Offerings [Line Items]          
Maximum common units authorized for issuance         $ 1,920,000
Remaining units available for issuance         $ 1,920,000
2013 At-the-Market Registration [Member]          
Registration Statements and Equity Offerings [Line Items]          
Maximum common units authorized for issuance   1,250,000      
Remaining units available for issuance   $ 424,600      
Net Cash Proceeds from Sale of Common Units [Abstract]          
Number of common units issued (in units)   23,258,453 1,590,334    
Gross proceeds from the sale of common units   $ 767,100 $ 58,300    
Net cash proceeds from the issuance of common units   $ 760,000 $ 57,700    
2013 At-the-Market Registration [Member] | EPCO and affiliates [Member]          
Net Cash Proceeds from Sale of Common Units [Abstract]          
Number of common units issued (in units) 3,225,057 3,225,057      
Net cash proceeds from the issuance of common units   $ 100,000