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Share Tracking Award Plans (Details 2) (USD $)
3 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based compensation (benefit) expense recognized in connection with the STAP          
Share-based compensation expense (benefit), net of taxes $ 140,300,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax $ 111,200,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax      
Share tracking award plans (STAP)          
Share-based compensation (benefit) expense recognized in connection with the STAP          
Share-based compensation expense (benefit) before taxes     159,489,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
283,886,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
26,850,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
Related income tax (benefit) expense     (56,560,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
(106,693,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
(9,902,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
Share-based compensation expense (benefit), net of taxes     102,929,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
177,193,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
16,948,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
Share-based compensation capitalized as part of inventory     2,027,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
1,593,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
275,000us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsCapitalizedAmount
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
Cash payments on awards exercised during the period     144,100,000us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
55,900,000us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
31,800,000us-gaap_EmployeeServiceShareBasedCompensationCashFlowEffectCashUsedToSettleAwards
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
Research and development | Share tracking award plans (STAP)          
Share-based compensation (benefit) expense recognized in connection with the STAP          
Share-based compensation expense (benefit) before taxes     72,269,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
134,355,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
11,130,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
Selling, general and administrative | Share tracking award plans (STAP)          
Share-based compensation (benefit) expense recognized in connection with the STAP          
Share-based compensation expense (benefit) before taxes     82,937,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
143,407,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
14,490,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
Cost of product sales | Share tracking award plans (STAP)          
Share-based compensation (benefit) expense recognized in connection with the STAP          
Share-based compensation expense (benefit) before taxes     $ 4,283,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
$ 6,124,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
$ 1,230,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= uthr_ShareTrackingAwardsPlanMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember