Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Long-term Purchase Commitment [Line Items]
Total future drilling commitments at balance sheet date	$ 227.0
Drilling commitments 2017	138.0
Drilling commitments 2018	59.0
Drilling commitments 2019	29.0
Drilling commitments 2020	1.0
Damages claimed related to contingency matter	200.0
Legal proceedings recorded as a liability under other noncurrent liabilities	$ 6.5	$ 6.1
Future Drilling Commitments End Date	2020-01
Pipeline Transportation and Processing Commitments [Member]
Long-term Purchase Commitment [Line Items]
Future commitment, end date	2027
Future commitment, total	$ 840.0
Future commitment, due in 2017	221.0
Future commitment, due in 2018	215.0
Future commitment, due in 2019	162.0
Future commitment, due in 2020	55.0
Future commitment, due in 2021	44.0
Future commitments, thereafter	$ 143.0

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Drilling commitments year one

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Drilling Commitments Year Three

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Drilling Commitments Year Two

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Total future drilling commitments at balance sheet date

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Purchase Obligation Agreement Expiration Date

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The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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