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Organization Disclosure	12 Months Ended
Organization Disclosure	Dec. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	(All amounts in this Report on Form 10-K are expressed in thousands of U.S. dollars (except per share data), unless otherwise noted). Ultra Petroleum Corp. (the “Company”) is an independent oil and natural gas company engaged in the acquisition, exploration, development, and production of oil and natural gas properties. The Company is incorporated under the laws of Yukon, Canada. The Company’s principal business activities are in the Green River Basin of southwest Wyoming, the north-central Pennsylvania area of the Appalachian Basin and in the Uinta Basin in northeast Utah.