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Subsequent Events (Details) (USD $)
12 Months Ended 9 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 28, 2014
Feb. 09, 2015
May 05, 2015
Nov. 17, 2014
Apr. 14, 2015
Nov. 10, 2009
Sep. 29, 2011
Subsequent events                    
Interest payments $ 24,808,000us-gaap_InterestPaid $ 22,198,000us-gaap_InterestPaid $ 22,075,000us-gaap_InterestPaid              
Payment of fees and expenses 2,120,000us-gaap_PaymentsOfDebtIssuanceCosts   1,636,000us-gaap_PaymentsOfDebtIssuanceCosts              
Senior Notes                    
Subsequent events                    
Interest rate (as a percent)                 8.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
MS Term Loan                    
Subsequent events                    
Period following each fiscal year within which to provide audited financials per debt covenant       90 days            
Credit Agreement                    
Subsequent events                    
Maximum borrowing capacity                   50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
Subsequent event | Cortland | Credit Agreement                    
Subsequent events                    
Additional liquidity         13,200,000coltdef_NetCashProceedsFromLoan
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= coltdef_CortlandCapitalMarketServicesLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
         
Payment of fees and expenses         2,400,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= coltdef_CortlandCapitalMarketServicesLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
         
Interest rate (as a percent)         10.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= coltdef_CortlandCapitalMarketServicesLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
         
Subsequent event | Cortland | Credit Agreement | Term loan due August 15, 2018                    
Subsequent events                    
Face amount of term loan facility         33,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
/ us-gaap_DebtInstrumentAxis
= coltdef_TermLoanDueAugust2018Member
/ us-gaap_LineOfCreditFacilityAxis
= coltdef_CortlandCapitalMarketServicesLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
         
Subsequent event | Cortland | Letters of credit facility                    
Subsequent events                    
Maximum borrowing capacity         7,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= coltdef_CortlandCapitalMarketServicesLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
         
Cash collateral         5,300,000us-gaap_CashCollateralForBorrowedSecurities
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= coltdef_CortlandCapitalMarketServicesLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
         
Amount available under credit agreement         1,700,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_StandbyLettersOfCreditMember
/ us-gaap_LineOfCreditFacilityAxis
= coltdef_CortlandCapitalMarketServicesLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
         
Subsequent event | Senior Notes                    
Subsequent events                    
Minimum percentage of the aggregate principal amount of debt held for which holders may provide notice to the borrower for non-compliance           25.00%coltdef_DebtInstrumentCovenantMinimumPercentageOfAggregatePrincipalAmountHeldForWhichHoldersMayProvideNoticeOfNonCompliance
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
       
Period from receipt of notice of non-compliance from holders that entity must cure debt before acceleration of repayment           60 days        
Interest payments             10,900,000us-gaap_InterestPaid
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Subsequent event | MS Term Loan                    
Subsequent events                    
Face amount of term loan facility             70,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= coltdef_TermLoanMsFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Additional liquidity             4,100,000coltdef_NetCashProceedsFromLoan
/ us-gaap_LongtermDebtTypeAxis
= coltdef_TermLoanMsFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Payment of fees and expenses             2,000,000us-gaap_PaymentsOfDebtIssuanceCosts
/ us-gaap_LongtermDebtTypeAxis
= coltdef_TermLoanMsFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Percentage of accrual of interest in cash             8.00%coltdef_LineOfCreditFacilityRateOfAccrualOfInterestInCash
/ us-gaap_LongtermDebtTypeAxis
= coltdef_TermLoanMsFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Percentage of accrual of interest in kind             2.00%coltdef_LineOfCreditFacilityRateOfAccrualOfInterestInKind
/ us-gaap_LongtermDebtTypeAxis
= coltdef_TermLoanMsFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Subsequent event | Term Loan                    
Subsequent events                    
Repayments of Debt             53,000,000us-gaap_RepaymentsOfDebt
/ us-gaap_LongtermDebtTypeAxis
= coltdef_TermLoanDueNovember152016Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Amount of premium payable             4,300,000us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_LongtermDebtTypeAxis
= coltdef_TermLoanDueNovember152016Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Subsequent event | Credit Agreement                    
Subsequent events                    
Repayments of Debt         12,100,000us-gaap_RepaymentsOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
         
Maximum borrowing capacity             33,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Threshold minimum borrowing capacity             7,500,000coltdef_LineOfCreditFacilityThresholdBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Letters of credit         $ 4,800,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
         
Subsequent event | Forecast | New Notes                    
Subsequent events                    
Interest rate (as a percent)               10.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= coltdef_JuniorPrioritySeniorSecuredNotesDue2023Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Debt exchange ratio               0.300coltdef_DebtInstrumentExchangeRatio
/ us-gaap_DebtInstrumentAxis
= coltdef_JuniorPrioritySeniorSecuredNotesDue2023Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Minimum percentage of Senior Notes tendered necessary for closing of Exchange Offer               98.00%coltdef_DebtInstrumentMinimumPercentageOfPrincipalAmountOfDebtTenderedNecessaryForClosingOfDebtOffering
/ us-gaap_DebtInstrumentAxis
= coltdef_JuniorPrioritySeniorSecuredNotesDue2023Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Percentage of principal amount of debt to be cancelled in exchange for pro rata share of new debt issuance under Chapter 11 bankruptcy petitions               100.00%coltdef_DebtInstrumentPercentageOfPrincipalAmountOfDebtToBeCancelledInExchangeForProRataShareOfNewDebtIssuanceUnderChapter11BankruptcyPetitions
/ us-gaap_DebtInstrumentAxis
= coltdef_JuniorPrioritySeniorSecuredNotesDue2023Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Percentage of principal amount of debt tendered in exchange offer for similarity to debt restructuring under Chapter11 Bankruptcy petitions               100.00%coltdef_DebtInstrumentPercentageOfPrincipalAmountOfDebtTendederedInExchangeOfferForSimilarityToDebtRestructuringUnderChapter11BankruptcyPetitions
/ us-gaap_DebtInstrumentAxis
= coltdef_JuniorPrioritySeniorSecuredNotesDue2023Member
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Subsequent event | Forecast | Senior Notes                    
Subsequent events                    
Additional consent payment ratio               0.50coltdef_DebtInstrumentAdditionalConsentPaymentRatio
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember