Document and Entity Information - USD ($)	9 Months Ended
	Sep. 30, 2016	Oct. 19, 2016	Jun. 30, 2015
Document and Entity Information
Entity Registrant Name	Ultra Petroleum Corp.
Entity Central Index Key	0001022646
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 1,918,659,990
Entity Common Stock, Shares Outstanding		153,398,599
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Trading Symbol	UPLMQ