Derivative Instruments - Additional Information (Detail) $ in Thousands	8 Months Ended	12 Months Ended
	Sep. 12, 2016 USD ($)	Dec. 31, 2018 USD ($) Entity	Dec. 31, 2017 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative Asset		$ 45,032	$ 0
Predecessor [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivatives Settled	$ 63,000
Derivatives settled to reduce outstanding debt	$ 51,979
Commodity contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative Asset		$ 44,000
Number Of Derivative Counterparty | Entity		8
Commodity contracts | Crude Oil
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Third-party quoted forward prices		WTI crude oil
Commodity contracts | Louisiana Light Sweet [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Third-party quoted forward prices		LLS