Annual report pursuant to Section 13 and 15(d)

Reconciliation of Asset Retirement Obligations which are Included in Other Liabilities (Detail)

v3.6.0.2
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