Earnings Per Share - Additional Information (Details) - Ultra Resources, Inc. - Exchange Agreement	Jun. 30, 2019 d $ / shares
Volume-weighted average price of the Common Shares for warrants exercise \| $ / shares \| $ / shares	$ 2.50
Number of consecutive trading days \| d	30

Volume-weighted average price of common stock required for warrants exercise.

No definition available.

Name:	upl_VolumeWeightedAveragePriceOfCommonStockRequiredForWarrantsExercise
Namespace Prefix:	upl_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant