Disclosures about Oil and Natural Gas Activities (Unaudited) - Changes in Standardized Measure of Discounted Future Net Cash Flows (Detail) - Predecessor - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]      
Beginning of year $ 684,689 $ 1,894,700 $ 1,743,772
Sale of oil and natural gas produced, net of production costs (141,732) (196,319) (502,928)
Net changes in prices and production costs (296,299) (2,230,601) 116,977
Extensions and discoveries 79,990 101,384 286,500
Improved recoveries 0 524,436 148,673
Changes in future development costs 278,653 204,199 (91,027)
Development costs incurred during the period that reduced future development costs 63,894 80,103 316,490
Revisions of previous quantity estimates [1] (223,218) (495,794) (40,481)
Purchases and sales of reserves in place, net 0 (47,079) (278,825)
Accretion of discount 68,545 237,134 223,324
Net change in income taxes 21,139 605,766 (46,584)
Changes in production rates and other (6,880) 6,760 18,809
End of year $ 528,781 $ 684,689 $ 1,894,700
[1] Amounts in 2016 are primarily the result of removing proved undeveloped reserves that are not expected to be developed within the five years, a revision in the base water flood decline curve at our North Burbank Unit and the decline in SEC pricing which resulted in future extraction of certain reserves being uneconomic. Amounts in 2015 are primarily the result of the decrease in SEC pricing, lower margins on existing reserves and a decrease in taxes as a result of the lower margins.