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Partnership Organization and Formation - Additional Information (Details) Customer in Millions | Sep. 30, 2017 Customer Location State shares | Sep. 24, 2016 shares
--- | --- | ---
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items] |  |
Common units outstanding (in units) | 61,104,544 | 60,789,000
Ownership interest in Suburban Energy Finance Corp (in hundredths) | 100.00% |
Number of residential, commercial, industrial and agricultural customers | Customer | 1.0 |
Number of locations served by the partnership | Location | 668 |
Number of states in which the partnership operates | State | 41 |
General Partner [Member] | Common Unitholders [Member] |  |
Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Effects Of Changes Net [Line Items] |  |
Common units outstanding (in units) | 784 |

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- Definition Number of locations served by the partnership as of the balance sheet date. + References No definition available. + Details
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