Derivative Financial Instruments - Additional Information (Details) - Bank Of Montreal - Revolving Credit Facility - Ultra Resources, Inc. - Second Amendment	3 Months Ended
	Mar. 31, 2019
Derivative [Line Items]
Hedging percentage on proved producing natural gas production for 18 months through September 29, 2019	65.00%
Hedging percentage on proved producing forecast for natural gas through March 30, 2020	50.00%
Maximum
Derivative [Line Items]
Hedging percentage on proved producing natural gas production for 18 months through September 29, 2019	65.00%
Hedging percentage on proved producing forecast for natural gas through March 30, 2020	50.00%
Line of credit facility maximum hedging percentage on forecast production for all products	85.00%