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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share for Continuing Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Numerator: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ (1,378)us-gaap_IncomeLossFromContinuingOperations | $ 7,320 us-gaap_IncomeLossFromContinuingOperations | $ 6,446 us-gaap_IncomeLossFromContinuingOperations | $ 18,026 us-gaap_IncomeLossFromContinuingOperations | $ (2,910)us-gaap_IncomeLossFromContinuingOperations | $ 5,592 us-gaap_IncomeLossFromContinuingOperations | $ 5,603 us-gaap_IncomeLossFromContinuingOperations | $ 17,094 us-gaap_IncomeLossFromContinuingOperations | $ 30,414 us-gaap_IncomeLossFromContinuingOperations | $ 25,379 us-gaap_IncomeLossFromContinuingOperations | $ 23,793 us-gaap_IncomeLossFromContinuingOperations
Basic |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding | 48,455 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,451 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,273 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,182 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 46,681 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,504 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 49,639 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 49,417 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,343 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,632 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 49,002 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  | 761 cbz_IncrementalCommonSharesAttributableToStockOptions | 194 cbz_IncrementalCommonSharesAttributableToStockOptions |
Restricted stock awards |  |  |  |  |  |  |  |  | 293 cbz_IncrementalCommonSharesAttributableToRestrictedStockAwards | 263 cbz_IncrementalCommonSharesAttributableToRestrictedStockAwards | 186 cbz_IncrementalCommonSharesAttributableToRestrictedStockAwards
Contingent shares |  |  |  |  |  |  |  |  | 129 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares | 52 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares | 64 us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Convertible senior subordinated notes |  |  |  |  |  |  |  |  | 1,961 us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities |  |
Diluted weighted average common shares outstanding | 48,455 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 51,209 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 52,052 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 52,618 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 46,981 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 49,003 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 49,929 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 49,836 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 51,487 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 49,141 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 49,252 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share from continuing operations | $ (0.03)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.15 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.13 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.37 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.06)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.12 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.11 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.35 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.63 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.52 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.49 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted earnings per share from continuing operations | $ (0.03)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.14 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.12 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.34 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.06)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.11 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.11 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.34 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.59 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.52 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.48 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare

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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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