Defined Contribution Plan, Company Contributions Vesting Period

No definition available.

Name:	fcfs_DefinedContributionPlanCompanyContributionsVestingPeriod
Namespace Prefix:	fcfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Defined Contribution Plan, Rate of Employer Match, Percent

+ References

No definition available.

+ Details

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

- Definition

Defined Contribution Plan, Vesting Period until Participation

+ References

No definition available.

+ Details

Name:	fcfs_DefinedContributionPlanVestingPeriodUntilParticipation
Namespace Prefix:	fcfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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

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

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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

- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=fcfs_FirstCashMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=fcfs_CashAmericaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanNameAxis=fcfs_QualifiedsavingsplanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
Benefit Plan (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Maximum annual contribution per employee	100.00%
Vesting period for company contributions	5 years
Employer contribution amount	$ 4.2	$ 2.0	$ 0.8
Minimum
Defined Contribution Plan Disclosure [Line Items]
Vesting period until participation in 401(k)	6 months
First Cash
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution	5.00%	6.00%
Rate of employer match	50.00%	40.00%
Cash America
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution	5.00%
Rate of employer match	50.00%
Qualified savings plan [Member] \| Cash America
Defined Contribution Plan Disclosure [Line Items]
Maximum annual contribution per employee	75.00%