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Debt And Capital Lease Obligations (Narrative) (Details) (USD $)
0 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended
Mar. 28, 2013
Dec. 31, 2014
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Jan. 30, 2015
Mar. 27, 2013
Jun. 25, 2014
Debt Instrument [Line Items]                
Percentage of aggregate principal to prepay, minimum (in hundredths)   10.00%cap_PercentageOfAggregatePrincipalToPrepayMinimum            
Revolving Credit Facility [Abstract]                
Number of business days short term borrowings payable, Maximum   10 days            
Letters of credit outstanding   $ 100,000us-gaap_LettersOfCreditOutstandingAmount 100,000us-gaap_LettersOfCreditOutstandingAmount   $ 100,000us-gaap_LettersOfCreditOutstandingAmount      
Net book value   1,564,777,000us-gaap_PropertyPlantAndEquipmentOther 1,564,777,000us-gaap_PropertyPlantAndEquipmentOther   1,465,092,000us-gaap_PropertyPlantAndEquipmentOther      
Term Loans [Abstract]                
Proceeds used to repay credit facility 124,400,000cap_ProceedsUsedToRepayCreditFacility              
Amortization term of facility   6 years            
Long term debt maturity [Abstract]                
Long-term debt   1,058,754,000us-gaap_LongTermDebt 1,058,754,000us-gaap_LongTermDebt   1,058,628,000us-gaap_LongTermDebt      
Restricted cash   8,232,000us-gaap_RestrictedCashAndCashEquivalents 8,232,000us-gaap_RestrictedCashAndCashEquivalents   9,253,000us-gaap_RestrictedCashAndCashEquivalents      
Estimated future principal and interest payments under capital lease obligations [Abstract]                
Capital lease obligation   2,583,000us-gaap_CapitalLeaseObligations 2,583,000us-gaap_CapitalLeaseObligations          
Short term line of credit   75,000,000us-gaap_LinesOfCreditCurrent 75,000,000us-gaap_LinesOfCreditCurrent          
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Maximum credit commitment   760,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
760,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
         
Maximum amount credit facility might be increased   960,000,000cap_LineOfCreditFacilityMaximumIncreasedAmountOfBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
960,000,000cap_LineOfCreditFacilityMaximumIncreasedAmountOfBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
         
Average Interest (in hundredths)   1.90%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
1.90%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
  1.90%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
     
Revolving Credit Facility [Abstract]                
Availability borrowing capacity   470,900,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
470,900,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
         
Revolving Credit Facility [Member] | Containers [Member]                
Revolving Credit Facility [Abstract]                
Net book value   565,300,000us-gaap_PropertyPlantAndEquipmentOther
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ContainersMember
565,300,000us-gaap_PropertyPlantAndEquipmentOther
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ContainersMember
         
Revolving Credit Facility [Member] | Subsequent Event [Member]                
Debt Instrument [Line Items]                
Maximum credit commitment           775,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Revolving Credit Facility [Member] | CAI Rail Inc [Member]                
Debt Instrument [Line Items]                
Maximum credit commitment   250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= cap_CaiRailIncMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= cap_CaiRailIncMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
         
Maximum amount credit facility might be increased   325,000,000cap_LineOfCreditFacilityMaximumIncreasedAmountOfBorrowingCapacity
/ dei_LegalEntityAxis
= cap_CaiRailIncMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
325,000,000cap_LineOfCreditFacilityMaximumIncreasedAmountOfBorrowingCapacity
/ dei_LegalEntityAxis
= cap_CaiRailIncMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
         
Average Interest (in hundredths)   1.90%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= cap_CaiRailIncMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
1.90%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= cap_CaiRailIncMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
  2.40%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= cap_CaiRailIncMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
     
Revolving Credit Facility [Abstract]                
Availability borrowing capacity   188,200,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ dei_LegalEntityAxis
= cap_CaiRailIncMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
188,200,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ dei_LegalEntityAxis
= cap_CaiRailIncMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
         
Revolving Credit Facility [Member] | CAI Rail Inc [Member] | CAI Rail Assets [Member]                
Revolving Credit Facility [Abstract]                
Net book value   83,700,000us-gaap_PropertyPlantAndEquipmentOther
/ dei_LegalEntityAxis
= cap_CaiRailIncMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cap_CaiRailAssetsMember
83,700,000us-gaap_PropertyPlantAndEquipmentOther
/ dei_LegalEntityAxis
= cap_CaiRailIncMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cap_CaiRailAssetsMember
         
Term Loan [Member]                
Term Loans [Abstract]                
Amount outstanding under the facility   147,800,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
147,800,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
         
Term Loan [Member] | Rental Equipment [Member]                
Revolving Credit Facility [Abstract]                
Net book value   357,300,000us-gaap_PropertyPlantAndEquipmentOther
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cap_RentalEquipmentMember
357,300,000us-gaap_PropertyPlantAndEquipmentOther
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cap_RentalEquipmentMember
         
Term Loan [Member] | Development Bank of Japan [Member]                
Debt Instrument [Line Items]                
Average Interest (in hundredths)   2.20%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= cap_DevelopmentBankOfJapanMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
2.20%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= cap_DevelopmentBankOfJapanMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
  2.30%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= cap_DevelopmentBankOfJapanMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
     
Term Loans [Abstract]                
Amount outstanding under the facility   27,300,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= cap_DevelopmentBankOfJapanMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
27,300,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= cap_DevelopmentBankOfJapanMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
         
Long term debt maturity [Abstract]                
Long-term debt   27,300,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= cap_DevelopmentBankOfJapanMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
27,300,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= cap_DevelopmentBankOfJapanMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
         
Term Loan [Member] | Consortium of Banks [Member]                
Debt Instrument [Line Items]                
Maximum credit commitment   300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
         
Average Interest (in hundredths)   1.80%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
1.80%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
  2.50%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
     
Term Loans [Abstract]                
Amount outstanding under the facility 125,000,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
          249,400,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
 
Long term debt maturity [Abstract]                
Long-term debt   147,750,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
147,750,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
         
Term Loan [Member] | Consortium of Banks, Note Dated April 11, 2012 [Member]                
Debt Instrument [Line Items]                
Maximum credit commitment   142,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedApril112012Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
142,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedApril112012Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
         
Maximum amount credit facility might be increased   200,000,000cap_LineOfCreditFacilityMaximumIncreasedAmountOfBorrowingCapacity
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedApril112012Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
200,000,000cap_LineOfCreditFacilityMaximumIncreasedAmountOfBorrowingCapacity
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedApril112012Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
         
Average Interest (in hundredths)   1.90%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedApril112012Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
1.90%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedApril112012Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
  2.20%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedApril112012Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
     
Term Loans [Abstract]                
Term of loan   5 years            
Amount outstanding under the facility   119,300,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedApril112012Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
119,300,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedApril112012Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
         
Periodic payments specified as percentage of drawn amount (in hundredths)   1.75%cap_PeriodicPaymentsSpecifiedAsPercentageOfDrawnAmount
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedApril112012Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
           
Long term debt maturity [Abstract]                
Long-term debt   119,320,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedApril112012Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
119,320,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedApril112012Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
         
Term Loan [Member] | Consortium Of Banks, Note Dated October 1, 2014 [Member]                
Debt Instrument [Line Items]                
Maximum credit commitment   150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedOctober12014Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
150,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedOctober12014Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
115,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedOctober12014Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
       
Term Loan [Member] | Consortium Of Banks, Note Dated October 1, 2014 [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Term Loans [Abstract]                
Basis spread on variable rate (in hundredths)     1.60%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedOctober12014Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedOctober12014Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
       
Term Loan [Member] | Variable Interest Entity, Primary Beneficiary [Member]                
Debt Instrument [Line Items]                
Average Interest (in hundredths)   2.60%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
2.60%us-gaap_DebtWeightedAverageInterestRate
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
         
Term Loans [Abstract]                
Amount outstanding under the facility   9,800,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
9,800,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
         
Term Loan [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Rental Equipment [Member]                
Revolving Credit Facility [Abstract]                
Net book value   20,100,000us-gaap_PropertyPlantAndEquipmentOther
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cap_RentalEquipmentMember
20,100,000us-gaap_PropertyPlantAndEquipmentOther
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cap_RentalEquipmentMember
         
Senior Secured Notes [Member]                
Debt Instrument [Line Items]                
Average Interest (in hundredths)   4.90%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
4.90%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
  4.90%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
     
Term Loans [Abstract]                
Amount outstanding under the facility   86,500,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
86,500,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
         
Long term debt maturity [Abstract]                
Long-term debt   86,520,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
86,520,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
  103,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
     
Senior Secured Notes [Member] | Rental Equipment [Member]                
Revolving Credit Facility [Abstract]                
Net book value   109,200,000us-gaap_PropertyPlantAndEquipmentOther
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cap_RentalEquipmentMember
109,200,000us-gaap_PropertyPlantAndEquipmentOther
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cap_RentalEquipmentMember
         
Asset Backed Warehouse Facility [Member]                
Debt Instrument [Line Items]                
Principal amount of loan         171,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= cap_AssetBackedWarehouseFacilityMember
     
Fixed rate, asset-backed notes   3.47%cap_DebtFixedInterestRate
/ us-gaap_LongtermDebtTypeAxis
= cap_AssetBackedWarehouseFacilityMember
3.47%cap_DebtFixedInterestRate
/ us-gaap_LongtermDebtTypeAxis
= cap_AssetBackedWarehouseFacilityMember
         
Term Loans [Abstract]                
Proceeds used for working capital purposes 229,000,000cap_ProceedsUsedForWorkingCapitalPurposes
/ us-gaap_LongtermDebtTypeAxis
= cap_AssetBackedWarehouseFacilityMember
             
Amount outstanding under the facility   134,000,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= cap_AssetBackedWarehouseFacilityMember
134,000,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= cap_AssetBackedWarehouseFacilityMember
         
Asset-backed Securities [Member]                
Debt Instrument [Line Items]                
Principal amount of loan   229,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
229,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
         
Average Interest (in hundredths)   3.40%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
3.40%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
  3.40%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
     
Fixed rate, asset-backed notes   3.35%cap_DebtFixedInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
3.35%cap_DebtFixedInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
         
Term Loans [Abstract]                
Amount outstanding under the facility   188,900,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
188,900,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
         
Long term debt maturity [Abstract]                
Long-term debt   322,875,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
322,875,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
         
Asset-backed Securities [Member] | Rental Equipment [Member]                
Revolving Credit Facility [Abstract]                
Net book value   411,400,000us-gaap_PropertyPlantAndEquipmentOther
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cap_RentalEquipmentMember
411,400,000us-gaap_PropertyPlantAndEquipmentOther
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cap_RentalEquipmentMember
         
Collateralized Financing Obligation [Member]                
Debt Instrument [Line Items]                
Average Interest (in hundredths)   0.80%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= cap_CollateralizedFinancingObligationMember
0.80%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= cap_CollateralizedFinancingObligationMember
  1.00%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= cap_CollateralizedFinancingObligationMember
     
Term Loans [Abstract]                
Amount outstanding under the facility   122,600,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= cap_CollateralizedFinancingObligationMember
122,600,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= cap_CollateralizedFinancingObligationMember
         
Long term debt maturity [Abstract]                
Long-term debt   122,574,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cap_CollateralizedFinancingObligationMember
122,574,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cap_CollateralizedFinancingObligationMember
         
Capital Lease Obligations [Abstract]                
Maturity date range start   Jun. 01, 2015            
Maturity date range end   Jun. 01, 2019            
Swing Line Loans [Member]                
Debt Instrument [Line Items]                
Maximum credit commitment   10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= cap_SwingLineLoansMember
10,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= cap_SwingLineLoansMember
         
Standby Letters of Credit [Member]                
Debt Instrument [Line Items]                
Maximum credit commitment   15,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_StandbyLettersOfCreditMember
15,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_StandbyLettersOfCreditMember
         
Letter of Credit [Member]                
Revolving Credit Facility [Abstract]                
Letters of credit outstanding   100,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LetterOfCreditMember
100,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LetterOfCreditMember
         
Term Loan II [Member] | Development Bank of Japan [Member]                
Debt Instrument [Line Items]                
Principal amount of loan   30,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= cap_DevelopmentBankOfJapanMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanIiMember
30,000,000us-gaap_DebtInstrumentFaceAmount
/ dei_LegalEntityAxis
= cap_DevelopmentBankOfJapanMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanIiMember
         
Term Loans [Abstract]                
Term of loan   5 years            
Number of quarterly installments   19cap_NumberOfQuarterlyInstallments
/ dei_LegalEntityAxis
= cap_DevelopmentBankOfJapanMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanIiMember
           
Quarterly payments of principal   500,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ dei_LegalEntityAxis
= cap_DevelopmentBankOfJapanMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanIiMember
           
Debt instrument final payment   21,500,000cap_DebtInstrumentBalloonPayment
/ dei_LegalEntityAxis
= cap_DevelopmentBankOfJapanMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanIiMember
21,500,000cap_DebtInstrumentBalloonPayment
/ dei_LegalEntityAxis
= cap_DevelopmentBankOfJapanMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanIiMember
         
Capital Lease Obligations [Member]                
Capital Lease Obligations [Abstract]                
Average fixed and floating interest rates   2.30%cap_AverageFixedAndFloatingInterestRates
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
2.30%cap_AverageFixedAndFloatingInterestRates
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
         
Maturity date range start   Mar. 01, 2015            
Maturity date range end   Jun. 01, 2019            
Capital Lease Obligations [Member] | Rental Equipment [Member]                
Revolving Credit Facility [Abstract]                
Net book value   4,300,000us-gaap_PropertyPlantAndEquipmentOther
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cap_RentalEquipmentMember
4,300,000us-gaap_PropertyPlantAndEquipmentOther
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cap_RentalEquipmentMember
         
Amortizing Term Loan [Member] | Variable Interest Entity, Primary Beneficiary [Member]                
Debt Instrument [Line Items]                
Fixed rate, asset-backed notes               2.70%cap_DebtFixedInterestRate
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
/ us-gaap_LongtermDebtTypeAxis
= cap_AmortizingTermLoanMember
Term Loans [Abstract]                
Term of loan   5 years            
Long term debt maturity [Abstract]                
Long-term debt               9,200,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
/ us-gaap_LongtermDebtTypeAxis
= cap_AmortizingTermLoanMember
Non-Amortizing Term Loan [Member] | Variable Interest Entity, Primary Beneficiary [Member]                
Term Loans [Abstract]                
Term of loan   5 years            
Long term debt maturity [Abstract]                
Long-term debt               1,600,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
/ us-gaap_LongtermDebtTypeAxis
= cap_NonAmortizingTermLoanMember
Short Term Line Of Credit [Member]                
Debt Instrument [Line Items]                
Maximum credit commitment   $ 75,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= cap_ShortTermLineOfCreditMember
75,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= cap_ShortTermLineOfCreditMember
         
Average Interest (in hundredths)   1.50%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= cap_ShortTermLineOfCreditMember
1.50%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= cap_ShortTermLineOfCreditMember
         
Fixed rate, asset-backed notes   1.50%cap_DebtFixedInterestRate
/ us-gaap_LongtermDebtTypeAxis
= cap_ShortTermLineOfCreditMember
1.50%cap_DebtFixedInterestRate
/ us-gaap_LongtermDebtTypeAxis
= cap_ShortTermLineOfCreditMember