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Partnership Operations, Organization and Basis of Presentation (Details) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 Common units [Member] | Dec. 31, 2011 Duncan Merger [Member] | Dec. 31, 2011 Duncan Merger [Member] Common units [Member] | Dec. 31, 2010 Holdings Merger [Member] | Dec. 31, 2010 Holdings Merger [Member] Common units [Member]
Partnership Operations, Organization and Basis of Presentation [Abstract] |  |  |  |  |  |  |
Number of reportable segments | 5 |  |  |  |  |  |
Limited partners ownership interest (in hundredths) | 100.00% |  |  |  |  |  |
Mergers [Line Items] |  |  |  |  |  |  |
Common unit exchange ratio in connection with merger |  |  |  | 1.01 | 1.01 | 1.5 | 1.5
Common units issued in connection with merger (in units) |  |  |  |  | 24,277,310 |  | 208,813,454
Common units cancelled immediately after merger (in units) |  |  | 21,563,177 |  |  |  | 21,563,177
General partner ownership interest cancelled as a result of merger (in hundredths) |  |  |  |  |  | 2.00% |
Number of years a privately held affiliate agreed to waive regular quarterly cash distributions (in years) |  |  |  |  |  | 5 |
Number of Designated Units (in units) | 26,130,000 | 30,610,000 |  |  |  |  |
Number of Designated Units to be excluded from distributions during 2013 | 23,700,000 |  |  |  |  |  |
Number of Designated Units to be excluded from distributions during 2014 | 22,560,000 |  |  |  |  |  |
Number of Designated Units to be excluded from distributions during 2015 | 17,690,000 |  |  |  |  |  |

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- Definition Basis for determining value of equity interest issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 99-12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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