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Cash Distributions and Net Income (Loss) per Common Unit - Summary Schedule of Distributions Paid (Details) (USD $)
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1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | |||||||||||||
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Sep. 30, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Jun. 30, 2012
Capital Unit, Class B
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Sep. 30, 2012
Capital Unit, Class B
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Dec. 31, 2011
Capital Unit, Class B
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Sep. 30, 2012
General Partner Units
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Sep. 30, 2012
Cash Distribution
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Sep. 30, 2012
Cash Distribution
October 1, 2011 to December 31, 2011
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Sep. 30, 2012
Cash Distribution
January 1, 2012 to March 31, 2012
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Sep. 30, 2012
Cash Distribution
April 1, 2012 to June 30, 2012
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Sep. 30, 2012
Cash Distribution
General Partner Units
October 1, 2011 to December 31, 2011
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Sep. 30, 2012
Cash Distribution
General Partner Units
January 1, 2012 to March 31, 2012
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Sep. 30, 2012
Cash Distribution
General Partner Units
April 1, 2012 to June 30, 2012
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Sep. 30, 2012
Cash Distribution
Subordinated Units
Limited Partner Units
October 1, 2011 to December 31, 2011
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Sep. 30, 2012
Cash Distribution
Subordinated Units
Limited Partner Units
January 1, 2012 to March 31, 2012
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Sep. 30, 2012
Cash Distribution
Subordinated Units
Limited Partner Units
April 1, 2012 to June 30, 2012
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Sep. 30, 2012
Cash Distribution
Common Units
Limited Partner Units
October 1, 2011 to December 31, 2011
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Sep. 30, 2012
Cash Distribution
Common Units
Limited Partner Units
January 1, 2012 to March 31, 2012
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Sep. 30, 2012
Cash Distribution
Common Units
Limited Partner Units
April 1, 2012 to June 30, 2012
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| 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 | |||||||||||||||||