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Commitments and Contingencies (Details 2) (Jointly owned utility plant, USD $)
In Millions, unless otherwise specified
Aug. 31, 2014
Jointly owned utility plant
  
Jointly Owned Utility Plant Interests [Line Items]  
Cost of construction $ 245.0hwtl_JointlyOwnedUtilityPlantAggregateConstructionCostShared
/ us-gaap_JointlyOwnedUtilityPlantAxis
= hwtl_JointlyOwnedUtilityPlantmMember
Company investment in construction costs of plant 25.0hwtl_JointlyOwnedUtilityPlantLongTermInvestmentAmount
/ us-gaap_JointlyOwnedUtilityPlantAxis
= hwtl_JointlyOwnedUtilityPlantmMember
Additional system capacity to be acquired in exchange for construction of landing station $ 5.0hwtl_JointlyOwnedUtilityPlantAdditionalCapacityToBeAcquiredInExchangeForConstructionOfCableLandingStation
/ us-gaap_JointlyOwnedUtilityPlantAxis
= hwtl_JointlyOwnedUtilityPlantmMember