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, 2015
Business Acquisition [Line Items]
Asset Retirement Obligation, Fresh Start Adjustment	$ 0	$ (754)	$ 0
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	2,687	2,621	5,890
Changes in estimates	27	176	172
Liabilities incurred	0	469	110
Liabilities settled	(311)	0	0
Sale of properties	0	0	(3,932)
Accretion expense	56	175	381
Balance at end of period	$ 2,459	$ 2,687	$ 2,621