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Subsequent Events (Details) (USD $) In Thousands, unless otherwise specified | Apr. 25, 2012 | Mar. 24, 2012
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Amended Credit Agreement Due 2017 [Member] |  |
Debt Instrument [Line Items] |  |
Commitment to provide the partnership with incremental term loan facility | $ 250,000 |
Revolving credit facility current borrowing capacity | 250,000 |
Commitment to increase revolving credit facility amount, maximum | 400,000 | 250,000
Inergy Propane LLC [Member] |  |
Business Acquisition [Line Items] |  |
Total acquisition value | 1,800,000 |
Newly issued senior notes to Inergy bondholders as a part of an acquisition | 1,000,000 |
Partial cash payment as a part of an acquisition | 200,000 |
New common units issued as a part of an acquisition | $ 600,000 |

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