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Employee Benefits - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Maximum percentage of a participant's eligible compensation that a participating may elect to contribute, on a tax-deferred annually to the plan (as a percent) 50.00%	80.00%
Percentage of matching contribution made by company, of first 6.0% of participating employees contributions (as a percent)	50.00%
Percentage of participating employees contribution, matched 100% (as a percent)	6.00%
Employer contribution	$ 11,100	$ 10,800	$ 10,400
Non-qualified deferred income (expense) of investment	19,200	(4,900)	$ 12,100
Non-qualified deferred compensation plan assets	106,851	84,435
Non-qualified deferred compensation plan liabilities	$ 106,851	$ 84,435

X

- Definition

Defined contribution plan maximum employee contribution percentage.

+ References

No definition available.

+ Details

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X

- Definition

Defined contribution plan percentage of base compensation.

+ References

No definition available.

+ Details

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X

- Definition

Non-qualified deferred compensation plan gain loss on investments.

+ References

No definition available.

+ Details

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Namespace Prefix:	cbz_
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X

- References

No definition available.

+ Details

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X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

+ References

No definition available.

+ Details

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X

- Definition

Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

+ 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 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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