Quarterly report pursuant to Section 13 or 15(d)

Cash Distributions and Net Income (Loss) per Common Unit - Schedule of Partner Distributions Made (Details)

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Cash Distributions and Net Income (Loss) per Common Unit - Schedule of Partner Distributions Made (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended
Mar. 31, 2013
Jun. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Common Units
Mar. 31, 2013
Common Units
Jun. 30, 2013
Common Units
May 28, 2013
Class B Unit [Member]
Sep. 30, 2012
Class B Unit [Member]
May 31, 2012
Class B Unit [Member]
Jun. 30, 2013
Class B Unit [Member]
Mar. 31, 2013
Class B Unit [Member]
Jun. 30, 2013
Class B Unit [Member]
Jun. 30, 2013
Subordinated Units
Mar. 31, 2013
Subordinated Units
Jun. 30, 2013
General Partner [Member]
Mar. 31, 2013
General Partner [Member]
Distribution Made to Member or Limited Partner [Line Items]                                
Number of days after quarter end distribution is paid     $ 45                          
Date paid Feb. 14, 2013 May 15, 2013                            
Distribution Made to Member or Limited Partner, Distributions Paid, Per Unit       $ 0.425 $ 0.425 $ 0.425             $ 0.000 $ 0.000    
Total distribution       24,259,000 16,783,000         0 0   0 0 495,000 342,000
Partner units issued and sold             12.0   133.3              
Partner units issued and sold, unit price ($US$ per unit)             $ 15.0 $ 15.00                
Proceeds from sale of partnership units                 2,000,000,000              
Discount upon issuance of Class B units representating beneficial conversion feature                       $ 2,130,000,000