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Summary of Significant Accounting Policies (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Goodwill and other intangible assets      
Goodwill, Gross $ 10,264,000us-gaap_GoodwillGross $ 10,703,000us-gaap_GoodwillGross  
Goodwill, Net 10,264,000us-gaap_Goodwill 10,703,000us-gaap_Goodwill  
Other intangible assets, Accumulated Amortization (8,432,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (8,604,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Other intangible assets, Net 3,701,000us-gaap_FiniteLivedIntangibleAssetsNet    
Total intangible assets, Gross 37,897,000uthr_GoodwillAndOtherIntangiblesAssetsGross 22,719,000uthr_GoodwillAndOtherIntangiblesAssetsGross  
Total intangible assets, Net 29,465,000us-gaap_IntangibleAssetsNetIncludingGoodwill 14,115,000us-gaap_IntangibleAssetsNetIncludingGoodwill  
Weighted-average life of finite-lived intangible assets 8 years 8 months 12 days    
Aggregate amortization expense relating to intangible assets 1,400,000us-gaap_AmortizationOfIntangibleAssets 2,600,000us-gaap_AmortizationOfIntangibleAssets 2,100,000us-gaap_AmortizationOfIntangibleAssets
Amortization relating to other intangible assets      
2015 1,081,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
2016 615,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2017 452,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2018 125,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
2019 125,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Thereafter 1,303,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Other intangible assets, Net 3,701,000us-gaap_FiniteLivedIntangibleAssetsNet    
Technology, patents and trade names      
Goodwill and other intangible assets      
Other intangible assets, Gross 6,494,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_TechnologyPatentsAndTradeNamesMember		 5,049,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_TechnologyPatentsAndTradeNamesMember		  
Other intangible assets, Accumulated Amortization (4,100,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_TechnologyPatentsAndTradeNamesMember		 (3,730,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_TechnologyPatentsAndTradeNamesMember		  
Other intangible assets, Net 2,394,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_TechnologyPatentsAndTradeNamesMember		 1,319,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_TechnologyPatentsAndTradeNamesMember		  
Amortization relating to other intangible assets      
Other intangible assets, Net 2,394,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_TechnologyPatentsAndTradeNamesMember		 1,319,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_TechnologyPatentsAndTradeNamesMember		  
In-process, research and development      
Goodwill and other intangible assets      
Other intangible assets, Gross 15,500,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		    
Other intangible assets, Net 15,500,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		    
Amortization relating to other intangible assets      
Other intangible assets, Net 15,500,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_InProcessResearchAndDevelopmentMember		    
Customer relationships and non-compete agreements      
Goodwill and other intangible assets      
Other intangible assets, Gross 4,369,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_CustomerRelationshipsAndNoncompeteAgreementsMember		 4,947,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_CustomerRelationshipsAndNoncompeteAgreementsMember		  
Other intangible assets, Accumulated Amortization (3,062,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_CustomerRelationshipsAndNoncompeteAgreementsMember		 (2,886,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_CustomerRelationshipsAndNoncompeteAgreementsMember		  
Other intangible assets, Net 1,307,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_CustomerRelationshipsAndNoncompeteAgreementsMember		 2,061,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_CustomerRelationshipsAndNoncompeteAgreementsMember		  
Amortization relating to other intangible assets      
Other intangible assets, Net 1,307,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_CustomerRelationshipsAndNoncompeteAgreementsMember		 2,061,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_CustomerRelationshipsAndNoncompeteAgreementsMember		  
Contract-based      
Goodwill and other intangible assets      
Other intangible assets, Gross 1,270,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_FiniteLivedContractBasedIntangibleAssetsMember		 2,020,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_FiniteLivedContractBasedIntangibleAssetsMember		  
Other intangible assets, Accumulated Amortization (1,270,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_FiniteLivedContractBasedIntangibleAssetsMember		 (1,988,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_FiniteLivedContractBasedIntangibleAssetsMember		  
Other intangible assets, Net   32,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_FiniteLivedContractBasedIntangibleAssetsMember		  
Amortization relating to other intangible assets      
Other intangible assets, Net   $ 32,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= uthr_FiniteLivedContractBasedIntangibleAssetsMember