Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Long-term Purchase Commitment [Line Items]
Total future drilling commitments at balance sheet date	$ 422.0
Drilling commitments 2016	200.0
Drilling commitments 2017	136.0
Drilling commitments 2018	62.0
Drilling commitments 2019	24.0
Damages claimed related to contingency matter	200.0
Legal proceedings recorded as a liability under other noncurrent liabilities	$ 6.1	$ 2.9
Future Drilling Commitments End Date	2019-12
Pipeline Transportation Commitments [Member]
Long-term Purchase Commitment [Line Items]
Future commitment, end date	2027
Future commitment, total	$ 1,000.0
Future commitment, due in 2016	215.0
Future commitment, due in 2017	212.0
Future commitment, due in 2018	207.0
Future commitment, due in 2019	154.0
Future commitment, due in 2020	47.0
Future commitments, thereafter	170.0
Non-operational Pipeline Transportation Commitments[Member]
Long-term Purchase Commitment [Line Items]
Future commitment, total	260.0
Fuel [Member]
Long-term Purchase Commitment [Line Items]
Future commitment, total	$ 31.0

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Total future drilling commitments at balance sheet date

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

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