Quarterly report pursuant to Section 13 or 15(d)

Cash Distributions and Net Income (Loss) per Common Unit - Summary Schedule of Distributions Paid (Details)

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Cash Distributions and Net Income (Loss) per Common Unit - Summary Schedule of Distributions Paid (Details) (USD $)
1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Jun. 30, 2012
Capital Unit, Class B
Sep. 30, 2012
Capital Unit, Class B
Dec. 31, 2011
Capital Unit, Class B
Sep. 30, 2012
General Partner Units
Sep. 30, 2012
Cash Distribution
Sep. 30, 2012
Cash Distribution
October 1, 2011 to December 31, 2011
Sep. 30, 2012
Cash Distribution
January 1, 2012 to March 31, 2012
Sep. 30, 2012
Cash Distribution
April 1, 2012 to June 30, 2012
Sep. 30, 2012
Cash Distribution
General Partner Units
October 1, 2011 to December 31, 2011
Sep. 30, 2012
Cash Distribution
General Partner Units
January 1, 2012 to March 31, 2012
Sep. 30, 2012
Cash Distribution
General Partner Units
April 1, 2012 to June 30, 2012
Sep. 30, 2012
Cash Distribution
Subordinated Units
Limited Partner Units
October 1, 2011 to December 31, 2011
Sep. 30, 2012
Cash Distribution
Subordinated Units
Limited Partner Units
January 1, 2012 to March 31, 2012
Sep. 30, 2012
Cash Distribution
Subordinated Units
Limited Partner Units
April 1, 2012 to June 30, 2012
Sep. 30, 2012
Cash Distribution
Common Units
Limited Partner Units
October 1, 2011 to December 31, 2011
Sep. 30, 2012
Cash Distribution
Common Units
Limited Partner Units
January 1, 2012 to March 31, 2012
Sep. 30, 2012
Cash Distribution
Common Units
Limited Partner Units
April 1, 2012 to June 30, 2012
Distribution Made to Member or Limited Partner [Line Items]                                        
Required distribution period of available cash               45 days                        
Date paid                 2/14/2012 5/14/2012 August 14, 2012                  
Cash distribution per common unit                 $ 0.425 $ 0.425 $ 0.425                  
Cash distribution paid         $ 0             $ 269,000 $ 272,000 $ 273,000 $ 0 $ 0 $ 0 $ 13,176,000 $ 13,323,000 $ 13,383,000
Class B unitholders, units issued         100,000,002 100,000,002                            
Price per Common Unit 25.07 15.25                                    
Proceeds from issuance of Class B Units       1,500,000,000                                
Partners' Capital Account, Exchanges and Conversions     $ 0   $ (1,450,000,000)   $ 0