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Equity and Distributions, Summary of Changes in Outstanding Units (Details) | 12 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 Common Units (Unrestricted) [Member] | Dec. 31, 2011 Common Units (Unrestricted) [Member] | Dec. 31, 2010 Common Units (Unrestricted) [Member] | Nov. 21, 2010 Common Units (Unrestricted) [Member] Holdings [Member] | Dec. 31, 2012 Restricted Common Units [Member] | Dec. 31, 2011 Restricted Common Units [Member] | Dec. 31, 2010 Restricted Common Units [Member] | Dec. 31, 2012 Common units [Member] | Dec. 31, 2011 Common units [Member] | Dec. 31, 2010 Common units [Member]
Summary of changes in outstanding units [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning Balance (in units) | 877,752,202 | 840,119,958 | 603,202,828 | 139,191,640 | 3,868,216 | 3,561,614 | 2,720,882 | 881,620,418 | 843,681,572 | 605,923,710
Common units issued in connection with underwritten offerings (in units) | 9,200,000 | 10,350,000 | 37,950,000 |  | 0 | 0 | 0 | 9,200,000 | 10,350,000 | 37,950,000
Common units issued in connection with at-the-market program (in units) | 3,978,545 |  |  |  | 0 |  |  | 3,978,545 |  |
Common units issued in connection with the Holdings Merger (in units) |  |  | 208,813,454 |  |  |  | 0 |  |  | 208,813,454
Common units cancelled in connection with the Holdings Merger (in units) |  |  | (21,563,177) |  |  |  | 0 |  |  | (21,563,177)
Common units issued in connection with Duncan Merger (in units) |  | 24,277,310 |  |  |  | 0 |  |  | 24,277,310 |
Common units issued in connection with DRIP and EUPP (in units) | 2,814,660 | 2,337,904 | 8,378,053 |  | 0 | 0 | 0 | 2,814,660 | 2,337,904 | 8,378,053
Common units issued in connection with acquisition of marine shipyard assets (in units) |  |  | 2,329,639 |  |  |  | 0 |  |  | 2,329,639
Common units issued to EPCO in exchange for equity interest in trucking business (in units) |  |  | 523,306 |  |  |  | 0 |  |  | 523,306
Common units issued in connection with the vesting of unit options (in units) | 213,914 |  | 193,030 |  | 0 |  | 0 | 213,914 |  | 193,030
Common units issued in connection with the vesting of restricted common unit awards (in units) | 1,316,603 | 924,108 | 383,628 | 3,424 | (1,316,603) | (924,108) | (383,628) | 0 | 0 | 0
Common units issued in connection with the vesting of other types of equity-based awards (in units) | 52,168 |  |  |  | 0 |  |  | 52,168 |  |
Restricted common units awards issued (in units) | 0 | 0 | 0 |  | 1,588,738 | 1,414,630 | 1,393,925 | 1,588,738 | 1,414,630 | 1,393,925
Forfeiture of restricted common unit awards (in units) | 0 | 0 | 0 |  | (246,865) | (183,920) | (169,565) | (246,865) | (183,920) | (169,565)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards (in units) | (408,241) | (255,276) | (103,241) |  | 0 | 0 | 0 | (408,241) | (255,276) | (103,241)
Other (in units) |  | (1,802) | 12,438 |  |  | 0 | 0 |  | (1,802) | 12,438
Ending Balance (in units) | 894,919,851 | 877,752,202 | 840,119,958 | 139,195,064 | 3,893,486 | 3,868,216 | 3,561,614 | 898,813,337 | 881,620,418 | 843,681,572

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