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Consolidation and Integration Reserve - Summary of Consolidation and Integration Reserve (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Collaboration Arrangement Disclosure [Abstract]      
Consolidation and Integration Reserve, Beginning Balance $ 1,011cbz_ConsolidationAndIntegrationReserve $ 1,264cbz_ConsolidationAndIntegrationReserve  
Adjustments against income 478cbz_ConsolidationAndIntegrationReserveAdjustments 642cbz_ConsolidationAndIntegrationReserveAdjustments 700cbz_ConsolidationAndIntegrationReserveAdjustments
Payments (365)cbz_ConsolidationAndIntegrationReservePayments (895)cbz_ConsolidationAndIntegrationReservePayments  
Consolidation and Integration Reserve, Ending Balance $ 1,124cbz_ConsolidationAndIntegrationReserve $ 1,011cbz_ConsolidationAndIntegrationReserve $ 1,264cbz_ConsolidationAndIntegrationReserve