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Accounts Receivable, Net - Accounts Receivables Net (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Accounts Receivable, Net, Current [Abstract]    
Trade accounts receivable $ 117,672cbz_TradeAccountsReceivable $ 107,174cbz_TradeAccountsReceivable
Unbilled revenue 82,364us-gaap_UnbilledReceivablesCurrent 47,789us-gaap_UnbilledReceivablesCurrent
Total accounts receivable 200,036us-gaap_AccountsReceivableGrossCurrent 154,963us-gaap_AccountsReceivableGrossCurrent
Allowance for doubtful accounts (11,552)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent (11,915)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Accounts receivable, net $ 188,484us-gaap_AccountsReceivableNetCurrent $ 143,048us-gaap_AccountsReceivableNetCurrent