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11. Fair Value measurements (Details-Fireside receivables) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
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