Accounts Payable and Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounts Payable and Accrued Expenses
Accounts payable	$ 6,995us-gaap_AccountsPayableCurrent	$ 6,708us-gaap_AccountsPayableCurrent
Accrued expenses:
Sales related (royalties, rebates and fees)	38,095	48,213
Payroll related	28,019	26,930
Research related	7,500uthr_AccruedResearchRelatedCostsCurrent	5,780uthr_AccruedResearchRelatedCostsCurrent
Other	4,773us-gaap_OtherAccruedLiabilitiesCurrent	4,613us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued expenses	78,387us-gaap_AccruedLiabilitiesCurrent	85,536us-gaap_AccruedLiabilitiesCurrent
Total accounts payable and accrued expenses	$ 85,382	$ 92,244

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for research related costs, used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for sales related royalties, rebates and fees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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No definition available.

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