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Revenues from Contracts with Customers - Schedule of Revenue Attributable to Identified Revenue Streams is Disaggregated (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |
Total Revenue |  | $ 759,474 | $ 1,516,082
Natural gas sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenue | [1] | 457,706 | 948,954
NGLs sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenue | [2] | 225,432 | 428,263
Oil sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total Revenue |  | $ 76,336 | $ 138,865
[1] | Natural gas sales revenue reported above for the second quarter includes $93.4 million of brokered revenues and $3.9 million of marketing revenue. The six months includes $149.3 million of brokered revenues and $7.7 million of marketing revenue.
[2] | NGLs sales revenue reported above for the second quarter includes $729,000 of brokered revenues and for six months includes $1.0 million of brokered revenues.

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