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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Data Type:	xbrli:monetaryItemType
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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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Extension in period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	uthr_DebtInstrumentExtensionTerm
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Amount of debt issuance cost capitalized during the period.

No definition available.

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The contingent increase above the maximum borrowing capacity under the credit facility, if any one or more of the existing banks or new banks agree to provide such increased commitment amount.

No definition available.

Name:	uthr_LineOfCreditFacilityContingentIncreaseAdditionalBorrowingCapacity
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Data Type:	xbrli:monetaryItemType
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Represents information pertaining to the number of extensions.

No definition available.

Name:	uthr_NumberOfExtensions
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Data Type:	xbrli:integerItemType
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It represents upfront payment for developing. manufacturing and commercialize ralinepag related to global license agreement.

No definition available.

Name:	uthr_UpfrontPayment
Namespace Prefix:	uthr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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Name:	us-gaap_LongtermDebtTypeAxis=uthr_CreditAgreementMember
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Data Type:	na
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Name:	us-gaap_LongtermDebtTypeAxis=uthr_CreditAgreement2018FirstUnsecuredRevolvingCreditFacilityMember
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Name:	us-gaap_LongtermDebtTypeAxis=uthr_CreditAgreement2018SecondUnsecuredRevolvingCreditFacilityMember
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