Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Millions |
Mar. 31, 2018 |
Dec. 31, 2017 |
| Related Party Transaction [Line Items] |
|
|
| Due from related parties, noncurrent |
$ 1
|
$ 1
|
| Crowley Blue Water Partners |
|
|
| Related Party Transaction [Line Items] |
|
|
| Equity method investments, ownership percentage |
50.00%
|
|
| Crowley Ocean Partners |
|
|
| Related Party Transaction [Line Items] |
|
|
| Equity method investments, ownership percentage |
50.00%
|
|
| Illinois Extension Pipeline |
|
|
| Related Party Transaction [Line Items] |
|
|
| Equity method investments, ownership percentage |
35.00%
|
|
| LOCAP |
|
|
| Related Party Transaction [Line Items] |
|
|
| Equity method investments, ownership percentage |
59.00%
|
|
| LOOP |
|
|
| Related Party Transaction [Line Items] |
|
|
| Equity method investments, ownership percentage |
51.00%
|
|
| MarkWest Utica EMG |
|
|
| Related Party Transaction [Line Items] |
|
|
| Equity method investments, ownership percentage |
56.00%
|
|
| Ohio Gathering |
|
|
| Related Party Transaction [Line Items] |
|
|
| Equity method investments, ownership percentage |
34.00%
|
|
| PFJ Southeast |
|
|
| Related Party Transaction [Line Items] |
|
|
| Equity method investments, ownership percentage |
29.00%
|
|
| Sherwood Midstream |
|
|
| Related Party Transaction [Line Items] |
|
|
| Equity method investments, ownership percentage |
50.00%
|
|
| Sherwood Midstream Holdings |
|
|
| Related Party Transaction [Line Items] |
|
|
| Equity method investments, ownership percentage |
81.00%
|
|
| TAAE |
|
|
| Related Party Transaction [Line Items] |
|
|
| Equity method investments, ownership percentage |
45.00%
|
|
| TACE |
|
|
| Related Party Transaction [Line Items] |
|
|
| Equity method investments, ownership percentage |
61.00%
|
|
| TAME |
|
|
| Related Party Transaction [Line Items] |
|
|
| Equity method investments, ownership percentage |
67.00%
|
|