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CREDIT ARRANGEMENT (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 12 Months Ended
Sep. 30, 2011
Dec. 31, 2014
Dec. 31, 2010
Dec. 31, 2011
Credit Agreement [Member]        
Line of Credit Facility [Line Items]        
Current borrowing capacity $ 50.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
     
Original borrowing capacity     60.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Maturity date Sep. 01, 2016   Dec. 22, 2011  
Sale leaseback transactions or real estate sales as covenant   100.0hvt_SaleLeasebackTransactionsOrRealEstateSalesAsCovenant
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Current borrowing base   57.6us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Outstanding letters of credit   0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Reduction in borrowing base due to deficit in fixed charges coverage ratio test   6.2us-gaap_LineOfCreditFacilityIncreaseDecreaseOtherNet
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Number of trailing months to compute fixed charges coverage ratio (in months)   12 months    
Net availability   43.8hvt_NetAvailability
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Letter of Credit [Member]        
Line of Credit Facility [Line Items]        
Current borrowing capacity       20.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
Outstanding letters of credit   $ 0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember