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Schedule of Composition of Futures Contracts (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Derivative [Line Items]    
Total fair value of Futures Contracts $ (296,516)us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure $ (202,501)us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
Futures Contracts Designed to Replicate Swaps    
Derivative [Line Items]    
Total fair value of Futures Contracts (293,502)us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_HedgingDesignationAxis
= hts_ForwardContractsCurrencySwapsMember		 (202,202)us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_HedgingDesignationAxis
= hts_ForwardContractsCurrencySwapsMember
Futures Contracts Designed to Hedge Value Changes in Forward Purchases    
Derivative [Line Items]    
Total fair value of Futures Contracts $ (3,014)us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 $ (299)us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember