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11. Fair Value measurements (Details-Fireside receivables) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Contractual Balance [Member] |  |
Fair values of the Fireside receivables and the related secured debt to their contractual balances |  |
Fireside receivables portfolio | $ 743cpss_FiresideReceivablesPortfolio / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = cpss_ContractualBalanceMember | $ 1,664cpss_FiresideReceivablesPortfolio / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = cpss_ContractualBalanceMember
Debt secured by Fireside receivables portfolio | 0cpss_DebtSecuredByFiresideReceivablesPortfolio / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = cpss_ContractualBalanceMember | 0cpss_DebtSecuredByFiresideReceivablesPortfolio / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = cpss_ContractualBalanceMember
Fair Value [Member] |  |
Fair values of the Fireside receivables and the related secured debt to their contractual balances |  |
Fireside receivables portfolio | 743cpss_FiresideReceivablesPortfolio / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 1,664cpss_FiresideReceivablesPortfolio / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Debt secured by Fireside receivables portfolio | $ 0cpss_DebtSecuredByFiresideReceivablesPortfolio / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | $ 1,250cpss_DebtSecuredByFiresideReceivablesPortfolio / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember

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- Definition Debt Secured By Fireside Receivables Portfolio. + References No definition available. + Details
Name: | cpss_DebtSecuredByFiresideReceivablesPortfolio
Namespace Prefix: | cpss_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | cpss_FairValuesOfFiresideReceivablesAndRelatedSecuredDebtToTheirContractualBalancesAbstract
Namespace Prefix: | cpss_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fireside Receivables Portfolio. + References No definition available. + Details
Name: | cpss_FiresideReceivablesPortfolio
Namespace Prefix: | cpss_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_EligibleItemOrGroupForFairValueOptionAxis=cpss_ContractualBalanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EligibleItemOrGroupForFairValueOptionAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |