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Income Taxes (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]        
Anticpated increase in equity, if deferred tax benefits are recognized $ 2,500,000us-gaap_UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward      
Unrecognized tax benefits 5,667,000us-gaap_UnrecognizedTaxBenefits 5,771,000us-gaap_UnrecognizedTaxBenefits 5,726,000us-gaap_UnrecognizedTaxBenefits 5,025,000us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact effective tax rate 600,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 800,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 900,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Unrecognized tax benefits that would not impact effective tax rate 5,100,000hill_UnrecognizedTaxBenefitsThatWouldNotImpactEffectiveTaxRate 5,000,000hill_UnrecognizedTaxBenefitsThatWouldNotImpactEffectiveTaxRate 4,800,000hill_UnrecognizedTaxBenefitsThatWouldNotImpactEffectiveTaxRate  
Income tax penalties and tax related interest accrued 500,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 400,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 200,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Valuation allowance 94,873,000us-gaap_DeferredTaxAssetsValuationAllowance 98,205,000us-gaap_DeferredTaxAssetsValuationAllowance    
Increase in unrecognized tax benefits from settlements with taxing authorities $ 0hill_UnrecognizedTaxBenefitsExpectedIncreaseResultingFromSettlementsOrReversalsWithTaxingAuthoritiesNextFiscalYear