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Accounts Receivable, Net - Accounts Receivables Net (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounts Receivable, Net, Current [Abstract]        
Trade accounts receivable $ 107,174cbz_TradeAccountsReceivable $ 105,814cbz_TradeAccountsReceivable    
Unbilled revenue, at net realizable value 47,789us-gaap_UnbilledReceivablesCurrent 42,224us-gaap_UnbilledReceivablesCurrent    
Total accounts receivable 154,963us-gaap_AccountsReceivableGrossCurrent 148,038us-gaap_AccountsReceivableGrossCurrent    
Allowance for doubtful accounts (11,915)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (9,975)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (11,363)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (8,689)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, net $ 143,048us-gaap_AccountsReceivableNetCurrent $ 138,063us-gaap_AccountsReceivableNetCurrent