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Revenues from Contracts with Customers - Schedule of Revenue Attributable to Identified Revenue Streams is Disaggregated (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items] |  |
Total Revenue | $ 756,608 |
Natural gas sales |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenue | 491,248 | [1]
NGLs sales |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenue | 202,831 | [2]
Oil sales |  |
Disaggregation of Revenue [Line Items] |  |
Total Revenue | $ 62,529 |
[1] | Natural gas sales revenue reported above includes $55.9 million of brokered revenues and $3.8 million of marketing revenue.
[2] | NGLs sales revenue reported above includes $304,000 of brokered revenues.

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