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Stock-Based Compensation Narrative (Details) (2007 Incentive Stock Plan, Restricted Stock, USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares approved for grant, restricted shares (in shares) 52,714us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted  
Non-cash stock based compensation $ 1.3us-gaap_AllocatedShareBasedCompensationExpense $ 1.1us-gaap_AllocatedShareBasedCompensationExpense
Unearned compensation expense, restricted shares $ 3.3us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions  
Estimated forfeiture rate, restricted shares (as a percent) 5.00%hnh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsEstimatedForfeitureRate  
Employees and Service Providers    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares approved for grant, restricted shares (in shares) 12,439us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= hnh_A2007IncentiveStockPlanMember
/ us-gaap_TitleOfIndividualAxis
= hnh_EmployeesandServiceProvidersMember		  
Award vesting period (in years) 3 years  
Directors    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares approved for grant, restricted shares (in shares) 40,275us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= hnh_A2007IncentiveStockPlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		  
Award vesting period (in years) 1 year