Summary of Significant Accounting Policies - Schedule of Gains and Losses from Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative [Line Items]
Gain (loss) from derivative financial instruments	$ (7,657)
Predecessor
Derivative [Line Items]
Gain (loss) from derivative financial instruments		$ 2,602
Gain (Loss) from Derivative Financial Instruments
Derivative [Line Items]
Gain (loss) from derivative financial instruments	(7,657)
Gain (Loss) from Derivative Financial Instruments | Predecessor
Derivative [Line Items]
Gain (loss) from derivative financial instruments		2,602
Gain (Loss) from Derivative Financial Instruments | Swap Contracts
Derivative [Line Items]
Gain (loss) from derivative financial instruments	3,157
Gain (Loss) from Derivative Financial Instruments | Swap Contracts | Predecessor
Derivative [Line Items]
Gain (loss) from derivative financial instruments		$ 2,602
Gain (Loss) from Derivative Financial Instruments | Collar Contracts
Derivative [Line Items]
Gain (loss) from derivative financial instruments	$ (10,814)