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Property, Plant and Equipment (Details) (USD $)
 1 Months Ended 12 Months Ended
Feb. 28, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, plant and equipment        
Property, plant and equipment   $ 843,589,000us-gaap_PropertyPlantAndEquipmentGross $ 729,364,000us-gaap_PropertyPlantAndEquipmentGross  
Less accumulated depreciation and amortization   277,633,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 204,989,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Total property, plant and equipment, net   565,956,000us-gaap_PropertyPlantAndEquipmentNet 524,375,000us-gaap_PropertyPlantAndEquipmentNet  
Depreciation expense   75,100,000us-gaap_Depreciation 74,500,000us-gaap_Depreciation 68,200,000us-gaap_Depreciation
Selling price of parcel of land and warehouse 13,900,000us-gaap_PropertyPlantAndEquipmentDisposals      
Commissions and other costs paid through escrow     800,000hwtl_PropertyPlantAndEquipmentDisposalsCommissionsAndOtherCosts  
Proceeds from sale, net of commissions and other costs paid     13,118,000us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment  
Gain on sale of parcel of land and warehouse     6,546,000us-gaap_GainLossOnDispositionOfAssets1  
Amount required to spend on training employees on broadband telecommunication deployment and operation     300,000hwtl_AmountRequiredToSpendOnTraining  
Proceeds received from sale of radio towers   2,900,000us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities    
Minimum lease term under sale and leaseback   10 years    
Land        
Property, plant and equipment        
Property, plant and equipment   67,278,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		 67,278,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		  
Building        
Property, plant and equipment        
Property, plant and equipment   110,852,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		 107,273,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		  
Central office equipment        
Property, plant and equipment        
Property, plant and equipment   177,283,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember		 149,940,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember		  
Outside Communications Plant        
Property, plant and equipment        
Property, plant and equipment   334,179,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hwtl_OutsideCommunicationsPlantMember		 290,201,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hwtl_OutsideCommunicationsPlantMember		  
Furniture, Vehicles And Other Equipment Member        
Property, plant and equipment        
Property, plant and equipment   60,290,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hwtl_FurnitureVehiclesAndOtherEquipmentMember		 42,613,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= hwtl_FurnitureVehiclesAndOtherEquipmentMember		  
Construction in Progress        
Property, plant and equipment        
Property, plant and equipment   28,214,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember		 24,557,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember		  
Software        
Property, plant and equipment        
Property, plant and equipment   54,635,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		 42,645,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember		  
Other        
Property, plant and equipment        
Property, plant and equipment   $ 10,858,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember		 $ 4,857,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember