Debt Covenant, Total Debt Ratio Threshold

No definition available.

Name:	fcfs_DebtCovenantTotalDebtRatioThreshold
Namespace Prefix:	fcfs_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Redemption Price (Up To), Percentage

+ References

No definition available.

+ Details

Name:	fcfs_DebtInstrumentRedemptionPriceUpToPercentage
Namespace Prefix:	fcfs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Leverage Ratio, Adjusted EBITDA

+ References

No definition available.

+ Details

Name:	fcfs_LineOfCreditFacilityLeverageRatioAdjustedEBITDA
Namespace Prefix:	fcfs_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Leverage Ratio, Temporary Adjusted Domestic EBITDA

+ References

No definition available.

+ Details

Name:	fcfs_LineOfCreditFacilityLeverageRatioTemporaryAdjustedDomesticEBITDA
Namespace Prefix:	fcfs_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Leverage Ratio, Temporary Adjusted EBITDA

+ References

No definition available.

+ Details

Name:	fcfs_LineOfCreditFacilityLeverageRatioTemporaryAdjustedEBITDA
Namespace Prefix:	fcfs_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Leverage Ratio, Adjusted Domestic EBITDA

+ References

No definition available.

+ Details

Name:	fcfs_LineofCreditFacilityLeverageRatioAdjustedDomesticEBITDA
Namespace Prefix:	fcfs_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Repurchase/redemption premiums on senior unsecured notes

+ References

No definition available.

+ Details

Name:	fcfs_Repurchaseredemptionpremiumsonseniorunsecurednotes
Namespace Prefix:	fcfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

+ Details

Name:	us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

Name:	us-gaap_WriteOffOfDeferredDebtIssuanceCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fcfs_RevolvingUnsecuredUncommittedCreditFacilitydue2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_PrimeRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=fcfs_MexicanCentralBankInterbankEquilibriumRateTIIEMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fcfs_A4625SeniorUnsecuredNotesDue2028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=fcfs_A5.375SeniorUnsecuredNotesdue2024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-Term Debt - Narrative (Details)			2 Months Ended		3 Months Ended	12 Months Ended
Long-Term Debt - Narrative (Details)	Dec. 31, 2020 USD ($)	Nov. 09, 2020	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 MXN ($)	Aug. 26, 2020 USD ($)	Dec. 19, 2019 USD ($)	May 30, 2017 USD ($)
Debt Instrument [Line Items]
Line of credit facility, leverage ratio, adjusted domestic EBITDA	4.0	4.0
Long-term line of credit	$ 123,000,000.0		$ 123,000,000.0	$ 123,000,000.0	$ 123,000,000.0	$ 123,000,000.0
Loss on extinguishment of debt						11,737,000	$ 0	$ 0
Debt Issuance Costs, Net	$ 7,100,000		$ 7,100,000	$ 7,100,000	7,100,000	7,100,000	3,400,000			$ 7,300,000
Repurchase/redemption premiums on senior unsecured notes					8,800,000	8,781,000	0	$ 0
Write off of Deferred Debt Issuance Cost					2,900,000
Line of Credit Facility, Leverage Ratio, Temporary Adjusted Domestic EBITDA	4.5	4.5	4.75
Line of Credit Facility, Leverage Ratio, Adjusted EBITDA	3.25	3.0
Line of Credit Facility, Leverage Ratio, Temporary Adjusted EBITDA	3.5	2.75	3.25	3.25
Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity											$ 500,000,000.0
Long-term line of credit	$ 123,000,000		$ 123,000,000	$ 123,000,000	123,000,000	123,000,000	$ 335,000,000
Letters of credit outstanding, amount	3,400,000		3,400,000	3,400,000	3,400,000	3,400,000
Remaining borrowing capacity	$ 373,600,000		$ 373,600,000	$ 373,600,000	$ 373,600,000	$ 373,600,000
Commitment fee percentage						0.325%
Interest rate at period end	2.63%		2.63%	2.63%	2.63%	2.63%			2.63%
Repayments of debt						$ (212,000,000.0)
Line of Credit \| Revolving Unsecured Uncommitted Credit Facility due 2023 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity									$ 600,000,000.0
Long-term line of credit									0
Remaining borrowing capacity									$ 600,000,000.0
Line of Credit \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate						2.50%
Line of Credit \| Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate						1.50%
Line of Credit \| Mexican Central Bank Interbank Equilibrium Rate (TIIE) [Member] \| Revolving Unsecured Uncommitted Credit Facility due 2023 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate						2.50%
Senior Notes \| 4.625% Senior Unsecured Notes due 2028 [Member]
Debt Instrument [Line Items]
Interest rate	4.625%		4.625%	4.625%	4.625%	4.625%			4.625%	4.625%
Face Amount										$ 500,000,000.0
Senior Notes \| Senior notes 2024
Debt Instrument [Line Items]
Interest rate	5.375%		5.375%	5.375%	5.375%	5.375%			5.375%			5.375%
Face Amount												$ 300,000,000.0
Total debt ratio threshold	2.75		2.75	2.75	2.75	2.75			2.75
Redemption price						100.00%
Redemption price (up to)						40.00%
Maximum \| Line of Credit
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage						50.00%
Minimum \| LIBOR
Debt Instrument [Line Items]
Interest rate	0.00%		0.00%	0.00%	0.00%	0.00%			0.00%
Minimum \| Line of Credit
Debt Instrument [Line Items]
Line of Credit Facility, Commitment Fee Percentage						32.50%