Subsequent Events - Additional Information (Detail) - Subsequent Event shares in Millions, $ in Millions		1 Months Ended
	Oct. 04, 2019 USD ($) shares	Nov. 30, 2019 USD ($) bbl / d $ / bbl
Subsequent Event [Line Items]
Cash receivable upon proposed transaction | $	$ 275
WTI | 2020
Subsequent Event [Line Items]
Floor price per barrel – WTI | $ / bbl		50
Monthly ceiling price | $ / bbl		70
Notional amount of outstanding average barrels of oil per day | bbl / d		80,000
Cost of derivative | $		$ 78
Hess Midstream | Hess Infrastructure Partners LP (HIP) | Oil And Gas Midstream Assets
Subsequent Event [Line Items]
Percentage of ownership interest	80.00%
Hess Midstream
Subsequent Event [Line Items]
Units receivable upon proposed transaction | shares	115
Number of units own upon completion of transaction | shares	134
Percentage of Midstream owned by upon completion of transaction	47.00%