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Fair Value Of Financial Instruments (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt $ 1,058,754,000us-gaap_LongTermDebt $ 1,058,628,000us-gaap_LongTermDebt
Fair value of collateralized financing obligations 120,400,000cap_CollateralizedFinancingObligationsFairValueDisclosure  
Fair value of revolving credit facility 350,800,000us-gaap_LinesOfCreditFairValueDisclosure  
Fair value of term loan 294,400,000us-gaap_LoansPayableFairValueDisclosure  
Capital lease obligation 2,583,000us-gaap_CapitalLeaseObligations  
Net investment in direct finance leases 95,000,000cap_CapitalLeasesNetInvestmentInDirectFinancingLeasesFairValueDisclosure  
Term Loan [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amount outstanding under the facility 147,800,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
 
Senior Secured Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amount outstanding under the facility 86,500,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
 
Long-term debt 86,520,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
103,000,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Fair value of term loan 86,500,000us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
 
Collateralized Financing Obligation [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amount outstanding under the facility 122,600,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= cap_CollateralizedFinancingObligationMember
 
Long-term debt 122,574,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= cap_CollateralizedFinancingObligationMember
 
Asset-backed Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amount outstanding under the facility 188,900,000us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
 
Long-term debt 322,875,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
 
Fair value of term loan 322,900,000us-gaap_LoansPayableFairValueDisclosure
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_AssetBackedSecuritiesMember
 
Consortium of Banks, Note Dated April 11, 2012 [Member] | Term Loan [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amount outstanding under the facility 119,300,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedApril112012Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
 
Long-term debt 119,320,000us-gaap_LongTermDebt
/ dei_LegalEntityAxis
= cap_ConsortiumOfBanksNoteDatedApril112012Member
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
 
Variable Interest Entity, Primary Beneficiary [Member] | Term Loan [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Amount outstanding under the facility 9,800,000us-gaap_LineOfCredit
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember
 
Fair value of term loan $ 9,800,000us-gaap_LoansPayableFairValueDisclosure
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
/ us-gaap_LongtermDebtTypeAxis
= cap_TermLoanMember