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Commitments and Contingencies - Additional Information (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Construction contracts		$ 67,900,000usdp_ConstructionContracts
Construction contracts, completed		45,000,000usdp_ConstructionContractsCompleted
Construction contracts, to be incurred in future periods		22,900,000
Other current liabilities	877,000us-gaap_OtherLiabilitiesCurrent	3,656,000us-gaap_OtherLiabilitiesCurrent
Retention balance, build-out of Hardistry rail terminal		$ 3,600,000us-gaap_RetentionPayable

Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes 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 and of liabilities not separately disclosed.

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