Consolidation and Integration Reserve (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidation and Integration Reserve (Textual) [Abstract]
Lease consolidation and abandonment	$ 800	$ 831	$ 2,300

Consolidation and integration reserve adjustments that were recorded to operating expenses during the current period.

No definition available.

Name:	cbz_ConsolidationAndIntegrationReserveAdjustments
Namespace Prefix:	cbz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration