Financial Risk Management Activities - Additional Information (Detail) - 2020 - Designated as Cash Flow Hedges	3 Months Ended
	Mar. 31, 2020 bbl / d $ / bbl
West Texas Intermediate
Derivative Instruments Gain Loss [Line Items]
Average monthly floor price | $ / bbl	55
Notional amount of outstanding average barrels of oil per day | bbl / d	130,000
Brent
Derivative Instruments Gain Loss [Line Items]
Average monthly floor price | $ / bbl	60
Notional amount of outstanding average barrels of oil per day | bbl / d	20,000