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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
bbl / d
Mcf / d
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Commitments And Contingencies Disclosure [Line Items]      
Rent expense under operating leases | $ $ 19.3 $ 19.1 $ 14.0
Minimum remaining terms of leases on undeveloped acreage, in years 3 years    
Maximum remaining terms of leases on undeveloped acreage, in years 5 years    
2021      
Commitments And Contingencies Disclosure [Line Items]      
Delivery commitments contingent upon pipeline construction or modification per day | bbl / d 3,000    
2035      
Commitments And Contingencies Disclosure [Line Items]      
Delivery commitments contingent upon pipeline construction or modification per day | bbl / d 10,000    
Natural Gas      
Commitments And Contingencies Disclosure [Line Items]      
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract 10 years    
Natural Gas | 2029      
Commitments And Contingencies Disclosure [Line Items]      
Transportation commitments contingent upon pipeline construction or modification 350,000    
Natural Gas | Late 2020      
Commitments And Contingencies Disclosure [Line Items]      
Delivery commitments contingent upon pipeline construction or modification per day 215,000    
Natural Gas | 2024      
Commitments And Contingencies Disclosure [Line Items]      
Delivery commitments contingent upon pipeline construction or modification per day 151,000    
Natural Gas | 2026 through Early 2029      
Commitments And Contingencies Disclosure [Line Items]      
Delivery commitments contingent upon pipeline construction or modification per day 100,000    
NGLs      
Commitments And Contingencies Disclosure [Line Items]      
Transportation and gathering commitments contingent upon pipeline construction or modification, term of contract 5 years    
NGLs | March 2025      
Commitments And Contingencies Disclosure [Line Items]      
Transportation commitments contingent upon pipeline construction or modification | bbl / d 20,000