Outstanding Debt And Other Long Term Obligations (Details) (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Short-term Debt [Abstract]
Current portion of long term debt	$ 100,000,000	$ 0
Long Term Obligations [Abstract]
Notes Payable to Bank	427,000,000	460,000,000
Other Notes Payable	1,910,000,000	2,010,000,000
Other Liabilities, Noncurrent	104,830,000	91,932,000
Total outstanding debt and other long term obligations	2,541,830,000	2,561,932,000
Senior Credit Facility Details [Abstract]
Revolving Bank Loan Comitment Value	1,000,000,000
Max Revolving Bank Loan Comitment Value	1,250,000,000
Letters Of Credit Available Credit Facility	250,000,000
Credit Facility Lender Consent Requirement	50.00%
Notes Payable to Bank	427,000,000	460,000,000
Debt Instrument, Unused Borrowing Capacity, Amount	573,000,000
Debt Instrument Interest Rate Terms Prime	1.25%
Debt Instrument Interest Rate Terms Libor	2.25%
Ultra Resources Inc Senior Notes
Senior Notes Ultra Resources Inc	1,560,000,000
Ultra Petroleum Corp Senior Notes
Senior Notes Ultra Petroleum Corp Interest Rate	5.75%
Senior Notes Ultra Petroleum Corp	$ 450,000,000
Debt Instrument Call Feature	On and after December 15, 2015, the Company may redeem all or, from time to time, a part of the Notes at the following prices expressed as a percentage of principal amount of the Notes: (2015 – 102.875%; 2016 – 101.438%; and 2017 and thereafter – 100.000%)