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Derivative Financial Instruments (Details) (Nymex Henry Hub [Member], USD $)
In Thousands, unless otherwise specified
Feb. 24, 2015
MMBTU
Dec. 31, 2014
MMBTU
January To March 2015 [Member]
    
Schedule Of Derivative Instruments [Line Items]    
Volume   210,000invest_DerivativeNonmonetaryNotionalAmount
/ upl_DerivativeByCommodityReferencePriceAxis
= upl_NymexHenryHubMember
/ upl_DerivativeByRemainingContractPeriodAxis
= upl_JanToMar2015Member
Average Price   4.54us-gaap_DerivativeSwapTypeAverageFixedPrice
/ upl_DerivativeByCommodityReferencePriceAxis
= upl_NymexHenryHubMember
/ upl_DerivativeByRemainingContractPeriodAxis
= upl_JanToMar2015Member
Fair Value   $ 29,201us-gaap_DerivativeFairValueOfDerivativeAsset
/ upl_DerivativeByCommodityReferencePriceAxis
= upl_NymexHenryHubMember
/ upl_DerivativeByRemainingContractPeriodAxis
= upl_JanToMar2015Member
Summer 2015 [Member]
    
Schedule Of Derivative Instruments [Line Items]    
Volume 150,000invest_DerivativeNonmonetaryNotionalAmount
/ upl_DerivativeByCommodityReferencePriceAxis
= upl_NymexHenryHubMember
/ upl_DerivativeByRemainingContractPeriodAxis
= upl_Summer2015Member		 522,500invest_DerivativeNonmonetaryNotionalAmount
/ upl_DerivativeByCommodityReferencePriceAxis
= upl_NymexHenryHubMember
/ upl_DerivativeByRemainingContractPeriodAxis
= upl_Summer2015Member
Average Price 2.98us-gaap_DerivativeSwapTypeAverageFixedPrice
/ upl_DerivativeByCommodityReferencePriceAxis
= upl_NymexHenryHubMember
/ upl_DerivativeByRemainingContractPeriodAxis
= upl_Summer2015Member		 3.65us-gaap_DerivativeSwapTypeAverageFixedPrice
/ upl_DerivativeByCommodityReferencePriceAxis
= upl_NymexHenryHubMember
/ upl_DerivativeByRemainingContractPeriodAxis
= upl_Summer2015Member
Fair Value   $ 74,989us-gaap_DerivativeFairValueOfDerivativeAsset
/ upl_DerivativeByCommodityReferencePriceAxis
= upl_NymexHenryHubMember
/ upl_DerivativeByRemainingContractPeriodAxis
= upl_Summer2015Member