v2.4.0.8

Basis Of Presentation And Significant Accounting Policies (Details) (Parent Company [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Parent Company [Member] |  |  |
Cash Flows Received By Parent From Unrestricted Subsidiaries | $ 312,887 | $ 318,198 | $ 88,701

X
- Definition Cash flows received by the parent from unrestricted subsidiaries. + References No definition available. + Details
Name: | cnc_CashFlowsReceivedByParentFromUnrestrictedSubsidiaries
Namespace Prefix: | cnc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration