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Temporary Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Temporary equity    
Total $ 23,218us-gaap_TemporaryEquityCarryingAmountAttributableToParent $ 45,037us-gaap_TemporaryEquityCarryingAmountAttributableToParent
Temporary equity component in convertible note due 2016    
Temporary equity    
Reclassification of Equity Component 12,336uthr_TemporaryEquityUnamortizedDiscountOnConvertibleDebtReclassifiedFromAdditionalPaidInCapitalToTemporaryEquity
/ us-gaap_StatementClassOfStockAxis
= uthr_TemporaryEquityConvertibleNoteDue2016Member
34,155uthr_TemporaryEquityUnamortizedDiscountOnConvertibleDebtReclassifiedFromAdditionalPaidInCapitalToTemporaryEquity
/ us-gaap_StatementClassOfStockAxis
= uthr_TemporaryEquityConvertibleNoteDue2016Member
Temporary equity common stocks subject to repurchase    
Temporary equity    
Common stock subject to repurchase $ 10,882us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
/ us-gaap_StatementClassOfStockAxis
= uthr_TemporaryEquityCommonStocksSubjectToRepurchaseMember
$ 10,882us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests
/ us-gaap_StatementClassOfStockAxis
= uthr_TemporaryEquityCommonStocksSubjectToRepurchaseMember
Common stock issued (in shares) 400,000us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= uthr_TemporaryEquityCommonStocksSubjectToRepurchaseMember
 
Repurchase price (in dollars per share) $ 27.21us-gaap_TemporaryEquityRedemptionPricePerShare
/ us-gaap_StatementClassOfStockAxis
= uthr_TemporaryEquityCommonStocksSubjectToRepurchaseMember