Commitments and Contingencies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Long-term Purchase Commitment [Line Items]
Future Drilling Commitments At Balance Sheet Date	$ 64,000
Purchase Obligation Agreement Expiration Date	2031
Future Drilling Commitments End Date	2020-11
Operating Lease, Liability	$ 9,128
Purchase Obligation	2,200,000
Purchase Obligation, Due in Next Twelve Months	291,000
Purchase Obligation, Due in Second Year	332,000
Purchase Obligation, Due in Third Year	330,000
Purchase Obligation, Due in Fourth Year	331,000
Purchase Obligation, Due in Fifth Year	298,000
Purchase Obligation, Due after Fifth Year	615,000
Drilling rig commitments [Member]
Long-term Purchase Commitment [Line Items]
Operating Lease, Liability	$ 3,154