v2.4.0.8

Product Sales Revenues (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2014
Product Sales Revenue [Abstract] |
Components of Product Sales Revenues | For the three and nine months ended September 30, 2013 and 2014, product sales revenue included the following (in thousands):
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2013 |  | 2014 |  | 2013 |  | 2014
Physical sale of petroleum products | $ | 146,887 |  |  | $ | 108,320 |  |  | $ | 500,347 |  |  | $ | 555,870 |
NYMEX contract adjustments: |  |  |  |  |  |  |
Change in value of NYMEX contracts that did not qualify for hedge accounting treatment and the effective portion of gains and losses of matured NYMEX contracts that qualified for hedge accounting treatment associated with our butane blending and fractionation activities(1) | (2,035 | ) |  | 47,546 |  |  | 4,149 |  |  | 33,703 |
Other | — |  |  | (1 | ) |  | (11 | ) |  | 12 |
Total NYMEX contract adjustments | (2,035 | ) |  | 47,545 |  |  | 4,138 |  |  | 33,715 |
Total product sales revenue | $ | 144,852 |  |  | $ | 155,865 |  |  | $ | 504,485 |  |  | $ | 589,585 |
(1) The associated petroleum products for these activities are, to the extent still owned as of the statement date, or were, to the extent no longer owned as of the statement date, classified as inventory in current assets on our consolidated balance sheets.

X
- Details
Name: | mmp_ProductSalesRevenueAbstract
Namespace Prefix: | mmp_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of product information that are included in the discussion of the nature of an entity's operations. + References No definition available. + Details
Name: | us-gaap_ScheduleOfProductInformationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration