CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 29,516us-gaap_NetIncomeLoss	$ 21,005us-gaap_NetIncomeLoss	$ 69,408us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Accretion of deferred acquisition fees	(16,213)cpss_AccretionOfDeferredAcquisitionFees	(20,565)cpss_AccretionOfDeferredAcquisitionFees	(15,957)cpss_AccretionOfDeferredAcquisitionFees
Accretion of purchase discount on receivables measured at fair value	(283)us-gaap_AccretionOfDiscount	(1,421)us-gaap_AccretionOfDiscount	(4,144)us-gaap_AccretionOfDiscount
Amortization of discount on securitization trust debt	130	600	1,913
Amortization of discount on senior secured debt, related party	623	1,992	2,296
Accretion of premium on debt secured by receivables measured at fair value	712	2,726	4,579
Mark to fair value on debt secured by receivables at fair value	(123)us-gaap_AssetsFairValueAdjustment	(747)us-gaap_AssetsFairValueAdjustment	7,113us-gaap_AssetsFairValueAdjustment
Mark to fair value of receivables measured at fair value	(27)	595	(6,634)
Depreciation and amortization	428	437	543
Amortization of deferred financing costs	6,767us-gaap_AmortizationOfFinancingCosts	6,803us-gaap_AmortizationOfFinancingCosts	5,954us-gaap_AmortizationOfFinancingCosts
Provision for credit losses	108,228us-gaap_ProvisionForLoanAndLeaseLosses	76,869us-gaap_ProvisionForLoanAndLeaseLosses	33,495us-gaap_ProvisionForLoanAndLeaseLosses
Provision for contingent liabilities	0cpss_ProvisionForContingentLiabilities	7,841cpss_ProvisionForContingentLiabilities	0cpss_ProvisionForContingentLiabilities
Stock-based compensation expense	3,835us-gaap_ShareBasedCompensation	3,864us-gaap_ShareBasedCompensation	1,134us-gaap_ShareBasedCompensation
Interest income on residual assets	(372)us-gaap_InterestIncomeOther	0us-gaap_InterestIncomeOther	(410)us-gaap_InterestIncomeOther
Gain on cancellation of debt	0	(10,947)	0
Change in fair value of warrants	0us-gaap_FairValueAdjustmentOfWarrants	0us-gaap_FairValueAdjustmentOfWarrants	695us-gaap_FairValueAdjustmentOfWarrants
Changes in assets and liabilities:
Accrued interest receivable	(4,702)	(8,259)	(3,979)
Other assets	(1,925)	(2,183)	5,625
Deferred tax assets, net	16,368	16,425	(60,640)
Accounts payable and accrued expenses	(7,135)	4,337	(6,002)
Net cash provided by operating activities	135,827	99,372	34,989
Cash flows from investing activities:
Purchases of finance receivables held for investment	(944,944)	(764,087)	(551,742)
Payments received on finance receivables held for investment	433,870	337,095	295,734
Payments on receivables portfolio at fair value	13,122	46,018	111,363
Proceeds received on residual interest in securitizations	1,158	3,970	0
Change in repossessions in inventory	(441)cpss_ChangeInRepossessionsInInventory	(4,246)cpss_ChangeInRepossessionsInInventory	(1,237)cpss_ChangeInRepossessionsInInventory
Decreases (increases) in restricted cash and equivalents, net	(43,098)	(27,839)	54,783
Purchase of furniture and equipment	(823)	(477)	(394)
Net cash used in investing activities	(541,156)	(409,566)	(91,493)
Cash flows from financing activities:
Proceeds from issuance of securitization trust debt	923,000	778,000	558,500
Proceeds from issuance of subordinated renewable notes	579	1,276	4,957
Proceeds from issuance of senior secured debt, related party	0us-gaap_ProceedsFromRelatedPartyDebt	5,284us-gaap_ProceedsFromRelatedPartyDebt	0us-gaap_ProceedsFromRelatedPartyDebt
Payments on subordinated renewable notes	(4,488)	(5,415)	(2,426)
Net proceeds from (repayments of) warehouse lines of credit	47,387us-gaap_RepaymentsOfLinesOfCredit	(12,279)us-gaap_RepaymentsOfLinesOfCredit	(3,662)us-gaap_RepaymentsOfLinesOfCredit
Net proceeds from (repayments of) residual interest financing debt	(6,769)	5,323	(8,111)
Repayment of securitization trust debt	(502,193)us-gaap_RepaymentsOfSecuredDebt	(382,591)us-gaap_RepaymentsOfSecuredDebt	(350,981)us-gaap_RepaymentsOfSecuredDebt
Repayment of debt secured by receivables measured at fair value	(12,456)	(45,969)	(121,413)
Repayment of senior secured debt, related party	(39,182)	(18,852)	(11,200)
Payment of financing costs	(8,058)	(8,734)	(7,059)
Repurchase of common stock	0	0	(435)
Exercise of options and warrants	3,256	3,297	1,206
Net cash provided by financing activities	401,076	319,340	59,376
Increase (decrease) in cash and cash equivalents	(4,253)	9,146	2,872
Cash and cash equivalents at beginning of year	22,112	12,966	10,094
Cash and cash equivalents at end of year	17,859	22,112	12,966
Cash paid during the period for:
Interest	45,914us-gaap_InterestPaidNet	50,663us-gaap_InterestPaidNet	75,654us-gaap_InterestPaidNet
Income taxes	6,520us-gaap_IncomeTaxesPaidNet	2,277us-gaap_IncomeTaxesPaidNet	1,139us-gaap_IncomeTaxesPaidNet
Non-cash financing activities:
Pension benefit obligation, net	3,956	(4,542)	(2,898)
Derivative warrants reclassified from liabilities to common stock upon amendment	$ 0	$ 583	$ 1,307

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