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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
LM4 |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of ownership in joint venture | 50.00% |  | 50.00% |
Credit Concentration Risk | Revenue |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues attributable to fee based commercial agreements | 100.00% | 100.00% | 100.00% | 100.00%
Hess |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Minimum volume shortfall fee payments | $ 7.8 | $ 3.0 | $ 11.9 | $ 6.5
Hess | Credit Concentration Risk | Revenue |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues attributable to fee based commercial agreements | 100.00% | 100.00% | 100.00% | 100.00%
Targa Resources Corp. | LM4 |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of ownership in joint venture | 50.00% |  | 50.00% |

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