v2.4.1.9

Summary Of Significant Accounting Policies (Schedule Of Percentage Of Company's Total Revenues) (Details)	12 Months Ended
	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: