Reconciliation of Asset Retirement Obligations which are Included in Other Liabilities (Detail) - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 12, 2016	Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	$ 2,700	$ 2,621
Balance at end of period		2,700
Predecessor [Member]
Business Acquisition [Line Items]
Asset Retirement Obligation, Fresh Start Adjustment		(754)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	2,687
Changes in estimates		176
Liabilities incurred		469
Liabilities settled		0
Purchase of properties		0
Accretion expense		175
Balance at end of period		$ 2,687
Successor [Member]
Business Acquisition [Line Items]
Asset Retirement Obligation, Fresh Start Adjustment	0		$ 0
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period			2,459
Changes in estimates	27		118
Liabilities incurred	0		149
Liabilities settled	(311)		(139)
Purchase of properties	0		(494)
Accretion expense	56		205
Balance at end of period	$ 2,459		$ 3,286