Voluntary Reorganization Under Chapter 11 (Details) - USD ($)			3 Months Ended
	Dec. 21, 2018	Apr. 12, 2017	Mar. 31, 2020	Dec. 31, 2019
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Petition date			May 14, 2020
Term loan			$ 2,078,035,000	$ 2,150,210,000
Professional, advisory, consulting, and legal fees			$ 2,600,000
DIP Credit Facility [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Line of credit facility, description			In connection with the RSA and the Chapter 11 Cases, Ultra Resources entered into a senior secured super priority debtor-in-possession credit agreement (the “DIP Credit Agreement”), dated as of May 19, 2020, among Ultra Resources, as borrower, UPE and the other Filing Subsidiaries, as guarantors, WTNA, as administrative agent and collateral agent, and the lenders party thereto. The DIP Credit Agreement provides for a multi-draw term loan credit facility in an aggregate principal amount of $25 million (the “DIP Facility”). Ultra intends to use proceeds of the DIP Facility, among other things: (1) to pay interest, fees, costs and expenses related to the loans thereunder, (2) to pay the fees, costs and expenses of the estate professionals retained in the Chapter 11 Cases and approved by the Court, (3) to pay certain fees, costs, disbursements and expenses of the Consenting Term Lenders, (4) to make all permitted payments of costs of administration of the Chapter 11 Cases, (5) to pay such prepetition expenses as are consented to in writing by the Required Lenders (as defined in the DIP Credit Agreement) and approved by the Court, (6) to satisfy any adequate protection obligations owing under the DIP Orders (as defined in the RSA); and (7) for general corporate and working capital purposes of the Debtors during the Chapter 11 Cases
Line of credit facility, initiation date			May 19, 2020
Line of credit facility, principal amount			$ 25,000,000
Restructuring Support Agreement [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Debtor-in possession financing, borrowings outstanding			25,000,000
Capital investments			85,000,000
Prepayment penality			0
Line of credit facility, commitment amount			60,000,000
Restructuring Support Agreement [Member] | Maximum
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Term loan			5,000,000
Restructuring Support Agreement [Member] | Revolving Credit Facility
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Line of credit facility, maximum borrowing capacity			100,000,000
Restructuring Support Agreement [Member] | Revolving Credit Facility | Maximum
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Letters of credit outstanding, amount			$ 15,000,000
Senior Secured Second Lien Notes due July 2024
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Senior notes due date	Jul. 31, 2024
Debt issued, interest rate	9.00%
Debt issued, paid in kind interest rate percentage	2.00%
6.875% Senior Notes due April 2022
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Senior notes due date		Apr. 30, 2022
Stated interest rate		6.875%
7.125% Senior Unsecured Notes due April 2025
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Senior notes due date		Apr. 30, 2025
Stated interest rate		7.125%
Credit Agreement | Restructuring Support Agreement [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Aggregate loan principal outstanding percentage			100.00%
Term Loan [Member] | Restructuring Support Agreement [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Aggregate loan principal outstanding percentage			85.00%
Second Lien Notes Indenture [Member] | Restructuring Support Agreement [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Aggregate loan principal outstanding percentage			67.00%