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Commitments And Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2015
Loss Contingencies [Line Items]        
Rent expense $ 1.2us-gaap_LeaseAndRentalExpense $ 1.2us-gaap_LeaseAndRentalExpense $ 1.1us-gaap_LeaseAndRentalExpense  
Unconditional purchase obligations 47.4us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount      
Loss Contingency, Estimate of Possible Loss 0.9hill_LossContingencyLossonUnrecordedPurchaseCommitments      
Contract Dispute [Member]        
Loss Contingencies [Line Items]        
Loss Contingency, Range of Possible Loss, Minimum 1.0us-gaap_LossContingencyRangeOfPossibleLossMinimum
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hill_ContractDisputeMember
     
Loss Contingency, Range of Possible Loss, Maximum 3.4us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hill_ContractDisputeMember
     
Loss Contingency Accrual 1.0us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= hill_ContractDisputeMember
     
Scenario, Forecast [Member]        
Loss Contingencies [Line Items]        
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax       $ (2.7)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationNetOfTax
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember