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Related Party Transactions - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Related Party Transaction [Line Items] |  |  |  |
Earnings from equity investments | $ 900,000 |  | $ 3,600,000 |
Distributions from equity investments |  |  | $ 3,800,000 |
LM4 |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Percentage of ownership in joint venture | 50.00% |  | 50.00% |
Expenses incurred under gas processing agreement | $ 5,000,000.0 | $ 0 | $ 11,400,000 | $ 0
Earnings from equity investments | $ 900,000 | $ 0 | 3,600,000 | $ 0
Distributions from equity investments |  |  | $ 3,800,000 |
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 | $ 3,100,000 | $ 700,000 | $ 4,100,000 | $ 3,500,000
Expenses incurred under gas processing agreement | $ 15,300,000 | $ 12,300,000 | $ 30,800,000 | $ 22,900,000
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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