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Acquisitions - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Business Acquisition [Line Items] |  |  |
Goodwill | $ 442,276 us-gaap_Goodwill | $ 435,231 us-gaap_Goodwill |
Clearview National Partners, L.L.C, Centric Insurance Agency and Lewis Birch & Richardo, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Cash |  |  | 131 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember
Accounts receivable, net |  |  | 1,555 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember
Work in process, net |  |  | 900 cbz_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkInProgress / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember
Other assets |  |  | 110 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember
Identifiable intangible assets | 2,844 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  | 5,803 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember
Current liabilities |  |  | (485)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember
Total identifiable net assets | 2,844 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  | 8,014 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember
Goodwill | 6,865 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  | 20,610 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember
Aggregate purchase price | $ 9,709 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember |  | $ 28,624 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cbz_SeriesOfBusinessAcquisitionTwoMember

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