Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 979	$ 771
Restricted cash	28,293	22,112
Accounts receivable, net	143,048us-gaap_AccountsReceivableNetCurrent	138,063us-gaap_AccountsReceivableNetCurrent
Deferred income taxes - current, net	3,638us-gaap_DeferredTaxAssetsNetCurrent	4,640us-gaap_DeferredTaxAssetsNetCurrent
Other current assets	15,292us-gaap_OtherAssetsCurrent	14,299us-gaap_OtherAssetsCurrent
Assets of discontinued operations	5,229	7,849
Current assets before funds held for clients	196,479	187,734
Funds held for clients	182,847us-gaap_FundsHeldForClients	164,389us-gaap_FundsHeldForClients
Total current assets	379,326us-gaap_AssetsCurrent	352,123us-gaap_AssetsCurrent
Property and equipment, net	18,475us-gaap_PropertyPlantAndEquipmentNet	18,955us-gaap_PropertyPlantAndEquipmentNet
Goodwill and other intangible assets, net	526,462	467,648
Assets of deferred compensation plan	60,290us-gaap_DeferredCompensationPlanAssets	51,953us-gaap_DeferredCompensationPlanAssets
Notes receivable - non-current	2,714	2,795
Deferred income taxes - non-current, net		542us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets	3,977us-gaap_OtherAssetsNoncurrent	3,442us-gaap_OtherAssetsNoncurrent
Total assets	991,244us-gaap_Assets	897,458us-gaap_Assets
Current liabilities:
Accounts payable	36,781us-gaap_AccountsPayableCurrent	37,291us-gaap_AccountsPayableCurrent
Income taxes payable	2,384us-gaap_AccruedIncomeTaxesCurrent	25us-gaap_AccruedIncomeTaxesCurrent
Accrued personnel costs	39,878	37,728
Notes payable - current	760us-gaap_NotesPayableCurrent	1,602us-gaap_NotesPayableCurrent
Contingent purchase price liability - current	16,692	12,243
Other current liabilities	13,434us-gaap_OtherLiabilitiesCurrent	12,767us-gaap_OtherLiabilitiesCurrent
Liabilities of discontinued operations	1,303	1,950
Current liabilities before client fund obligations	111,232	103,606
Client fund obligations	183,936cbz_ClientFundObligations	164,311cbz_ClientFundObligations
Total current liabilities	295,168us-gaap_LiabilitiesCurrent	267,917us-gaap_LiabilitiesCurrent
Convertible notes, net	96,569us-gaap_ConvertibleLongTermNotesPayable	125,256us-gaap_ConvertibleLongTermNotesPayable
Bank debt	107,400us-gaap_LongTermLineOfCredit	48,500us-gaap_LongTermLineOfCredit
Income taxes payable - non-current	4,166us-gaap_AccruedIncomeTaxesNoncurrent	6,154us-gaap_AccruedIncomeTaxesNoncurrent
Deferred income taxes - non-current	2,864
Deferred compensation plan obligations	60,290	51,953
Contingent purchase price liability - non-current	16,676	12,953
Other non-current liabilities	8,266us-gaap_OtherLiabilitiesNoncurrent	10,279us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	591,399us-gaap_Liabilities	523,012us-gaap_Liabilities
STOCKHOLDERS' EQUITY
Common stock, par value $0.01 per share; shares authorized 250,000; shares issued 118,820 and 114,957; shares outstanding 49,487 and 48,964	1,188us-gaap_CommonStockValue	1,149us-gaap_CommonStockValue
Additional paid-in capital	604,284	580,576
Retained earnings	220,753	190,994
Treasury stock, 69,333 and 65,993 shares	(425,685)us-gaap_TreasuryStockValue	(397,548)us-gaap_TreasuryStockValue
Accumulated other comprehensive loss	(695)	(725)
Total stockholders' equity	399,845us-gaap_StockholdersEquity	374,446us-gaap_StockholdersEquity
Total liabilities and stockholders' equity	$ 991,244	$ 897,458

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