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Revenues from Contracts with Customers - Disaggregation of Revenue by Identified Revenue Stream (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]      
Total Revenue $ 1,780,986 $ 2,600,934 $ 3,333,837
Natural Gas, NGLs and Oil Sales      
Disaggregation of Revenue [Line Items]      
Total Revenue 1,607,713 2,255,425 2,851,077
Natural Gas, NGLs and Oil Sales | Natural gas sales      
Disaggregation of Revenue [Line Items]      
Total Revenue 943,740 1,388,838 1,663,832
Natural Gas, NGLs and Oil Sales | NGLs sales      
Disaggregation of Revenue [Line Items]      
Total Revenue 578,454 681,134 931,360
Natural Gas, NGLs and Oil Sales | Oil sales      
Disaggregation of Revenue [Line Items]      
Total Revenue 85,519 185,453 255,885
Brokered Natural Gas, Marketing and Other      
Disaggregation of Revenue [Line Items]      
Total Revenue 173,273 345,509 482,760
Brokered Natural Gas, Marketing and Other | Natural gas sales      
Disaggregation of Revenue [Line Items]      
Total Revenue 160,122 332,006 459,634
Brokered Natural Gas, Marketing and Other | NGLs sales      
Disaggregation of Revenue [Line Items]      
Total Revenue 3,776 1,661 9,017
Brokered Natural Gas, Marketing and Other | Other marketing revenue      
Disaggregation of Revenue [Line Items]      
Total Revenue $ 9,375 $ 11,842 $ 14,109