v2.4.1.9

Summary Of Significant Accounting Policies (Schedule Of Percentage Of Company's Total Revenues) (Details) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
TEXAS |  |  |
Percentage of revenues under contracts or subcontracts | 25.00%cnc_PercentageOfRevenuesUnderContractsOrSubcontracts / us-gaap_StatementGeographicalAxis = stpr_TX | 37.00%cnc_PercentageOfRevenuesUnderContractsOrSubcontracts / us-gaap_StatementGeographicalAxis = stpr_TX | 40.00%cnc_PercentageOfRevenuesUnderContractsOrSubcontracts / us-gaap_StatementGeographicalAxis = stpr_TX
FLORIDA |  |  |
Percentage of revenues under contracts or subcontracts | 14.00%cnc_PercentageOfRevenuesUnderContractsOrSubcontracts / us-gaap_StatementGeographicalAxis = stpr_FL |  |

X
- Definition Percentage of revenues under contracts or subcontracts. + References No definition available. + Details
Name: | cnc_PercentageOfRevenuesUnderContractsOrSubcontracts
Namespace Prefix: | cnc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_FL
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=stpr_TX
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |