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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014 segment product	Dec. 31, 2013	Dec. 31, 2012
Segment Information
Number of operating segments									1us-gaap_NumberOfOperatingSegments
Number of commercial products									4uthr_CommercialProductsNumber
Net revenues, cost of product sales and gross profit
Revenues									$ 1,279,533us-gaap_SalesRevenueGoodsNet	$ 1,106,944us-gaap_SalesRevenueGoodsNet	$ 906,123us-gaap_SalesRevenueGoodsNet
Cost of product sales									125,883us-gaap_CostOfGoodsSold	131,127us-gaap_CostOfGoodsSold	119,297us-gaap_CostOfGoodsSold
Gross profit	329,611us-gaap_GrossProfit	287,466us-gaap_GrossProfit	282,620us-gaap_GrossProfit	253,953us-gaap_GrossProfit	247,519us-gaap_GrossProfit	269,290us-gaap_GrossProfit	245,175us-gaap_GrossProfit	213,833us-gaap_GrossProfit	1,153,650us-gaap_GrossProfit	975,817us-gaap_GrossProfit	786,826us-gaap_GrossProfit
Remodulin
Net revenues, cost of product sales and gross profit
Revenues									553,728	491,179	457,969
Cost of product sales									47,327	59,314	57,618
Gross profit									506,401	431,865	400,351
Tyvaso
Net revenues, cost of product sales and gross profit
Revenues									463,067	438,793	325,614
Cost of product sales									57,442	60,831	53,825
Gross profit									405,625	377,962	271,789
Adcirca [Member]
Net revenues, cost of product sales and gross profit
Revenues									221,471	176,972	122,540
Cost of product sales									13,495	10,982	7,854
Gross profit									207,976	165,990	114,686
Orenitram
Net revenues, cost of product sales and gross profit
Revenues									41,267
Cost of product sales									7,619
Gross profit									$ 33,648