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Stock-Based Compensation - Summary of Nonvested Restricted Stock Awards and PSU Activity (Detail)	6 Months Ended
	Jun. 30, 2022 $ / shares shares
Time-Based Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Unvested shares of restricted stock and PSUs outstanding at beginning of period | shares	369,600
Restricted Stock Awards and PSUs, Granted | shares	344,700
Restricted Stock Awards and PSUs, Vested | shares	(215,300)
Restricted Stock Awards and PSUs, Forfeited | shares	(31,500)
Unvested shares of restricted stock and PSUs outstanding at end of period | shares	467,500
Unvested shares of restricted stock and PSUs outstanding, Weighted Average Grant Date Fair Value Per Share, at beginning of period	$ 259.94
Granted, Weighted Average Grant Date Fair Value Per Share	285.89
Vested, Weighted Average Grant Date Fair Value Per Share	174.98
Forfeited, Weighted Average Grant Date Fair Value Per Share	317.45
Unvested shares of restricted stock and PSUs outstanding, Weighted Average Grant Date Fair Value Per Share, at end of period	$ 314.35
Market-Based Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Unvested shares of restricted stock and PSUs outstanding at beginning of period | shares	1,628,300
Restricted Stock Awards and PSUs, Granted | shares	59,500
Restricted Stock Awards and PSUs, Forfeited | shares	(5,700)
Unvested shares of restricted stock and PSUs outstanding at end of period | shares	1,682,100
Unvested shares of restricted stock and PSUs outstanding, Weighted Average Grant Date Fair Value Per Share, at beginning of period	$ 111.87
Granted, Weighted Average Grant Date Fair Value Per Share	268.93
Vested, Weighted Average Grant Date Fair Value Per Share	278.24
Forfeited, Weighted Average Grant Date Fair Value Per Share	279.88
Unvested shares of restricted stock and PSUs outstanding, Weighted Average Grant Date Fair Value Per Share, at end of period	$ 116.85
Performance-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Unvested shares of restricted stock and PSUs outstanding at beginning of period | shares	37,100
Restricted Stock Awards and PSUs, Granted | shares	51,500
Restricted Stock Awards and PSUs, Forfeited | shares	(10,800)
Unvested shares of restricted stock and PSUs outstanding at end of period | shares	77,800	[1]
Unvested shares of restricted stock and PSUs outstanding, Weighted Average Grant Date Fair Value Per Share, at beginning of period	$ 556.50
Granted, Weighted Average Grant Date Fair Value Per Share	296.07
Forfeited, Weighted Average Grant Date Fair Value Per Share	376.69
Unvested shares of restricted stock and PSUs outstanding, Weighted Average Grant Date Fair Value Per Share, at end of period	$ 409.13	[1]
[1] A maximum of 194,478 units could be awarded based upon Paycom’s Relative TSR over the applicable performance periods.

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(03)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(03)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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-Publisher FASB
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