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	$ 29,759us-gaap_NetIncomeLoss	$ 85,863us-gaap_NetIncomeLoss	$ 31,146us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Loss (gain) from discontinued operations activities, net of tax	655	(60,484)	(7,353)
Gain on sale of operations, net	(1,303)	(79)	(2,766)
Loss on early extinguishment of convertible debt	1,529
Depreciation and amortization expense	19,831	18,291	16,147
Amortization of discount on notes and deferred financing costs	4,169	4,568	4,227
Amortization on discount on contingent liability	128	106	181
Provision for credit losses and bad debt, net of recoveries	5,484	4,387	4,866
Adjustment to contingent earnout liability	(6,203)	1,102	(1,135)
Deferred income taxes	2,043	(416)	(1,376)
Employee stock awards	6,205	5,655	5,888
Excess tax benefits from share based payment arrangements	(503)	(53)
Changes in assets and liabilities, net of acquisitions and divestitures:
Restricted cash	(6,182)	(2,507)	518
Accounts receivable, net	(6,246)	(10,680)	(15,413)
Other assets	(3,027)	(3,244)	(6,016)
Accounts payable	(3,826)	1,482	4,156
Income taxes payable	(338)	(273)	4,786
Accrued personnel costs	1,643	3,398	4,813
Other liabilities	(701)	(5,109)	(3,271)
Net cash provided by continuing operations	43,117	42,007	39,398
Operating cash flows provided by (used in) discontinued operations	801	(43,525)	14,650
Net cash provided by (used in) operating activities	43,918	(1,518)	54,048
Cash flows from investing activities:
Business acquisitions and contingent consideration, net of cash acquired	(45,972)	(9,747)	(87,869)
Purchases of client fund investments	(14,089)cbz_PurchasesOfClientFundInvestments	(5,650)cbz_PurchasesOfClientFundInvestments	(5,742)cbz_PurchasesOfClientFundInvestments
Proceeds from the sales and maturities of client fund investments	6,671	4,896	6,926
Proceeds on sales of divested and discontinued operations	4,537	200,934	1,540
Decrease in funds held for clients	(11,223)	(9,438)	(6,256)
Additions to property and equipment, net	(4,837)	(6,208)	(2,426)
Payments on notes receivable	555	515	(3,384)
Other	24	(10)	(22)
Net cash (used in) provided by continuing operations	(64,334)	175,292	(97,233)
Investing cash flows provided by (used in) discontinued operations	416	(300)	(7,082)
Net cash (used in) provided by investing activities	(63,918)	174,992	(104,315)
Cash flows from financing activities:
Proceeds from bank debt	404,500	312,400	549,450
Payment of bank debt	(345,600)	(472,800)	(485,550)
Payment on early extinguishment of convertible debt	(30,621)
Payment for acquisition of treasury stock	(28,137)	(26,468)	(5,716)
Increase in client funds obligations	19,624	10,192	5,126
Payment of contingent consideration of acquisitions	(7,991)	(10,361)	(13,183)
Proceeds from exercise of stock options	11,356	13,976
Payment of notes payable	(1,690)us-gaap_RepaymentsOfNotesPayable	(594)us-gaap_RepaymentsOfNotesPayable
Deferred financing costs	(1,736)cbz_PaymentsOfDeferredFinancingCosts		(574)cbz_PaymentsOfDeferredFinancingCosts
Excess tax benefit from exercise of stock awards	503	53
Net cash provided by (used in) financing activities	20,208	(173,602)	49,553
Net increase (decrease) in cash and cash equivalents	208	(128)	(714)
Cash and cash equivalents at beginning of year	771	899	1,613
Cash and cash equivalents at end of year	$ 979	$ 771	$ 899

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

+ References

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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-Name Accounting Standards Codification

-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6516133

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The cash outflow to reacquire common stock during the period.

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The cash outflow for incremental, external costs directly pertaining to an early extinguishment of debt, including legal costs and prepayment penalties, and excluding interest and repayment of debt principal.

+ References

No definition available.

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- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The aggregate cash inflow comprised of the amount received from (a) employees to acquire the entity's shares under incentive awards, including stock option exercises and restricted stock arrangements, and (b) the excess tax benefit arising from such transactions.

+ References

No definition available.

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This element represents the cash inflow during the period from the sale of a component of the entity.

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The cash inflow 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 maturities due beyond one year or the operating cycle, if longer.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-SubTopic 10

-Section 45

-Paragraph 14

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- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

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-Subparagraph (SX 210.9-04.11)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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-Publisher FASB

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-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

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- Definition

The cash outflow for the settlement of obligation drawn 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 maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash outflow for a borrowing supported by a written promise to pay an obligation.

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