Name:	cvh_Businessacquisitionestimatedpurchaseprice
Namespace Prefix:	cvh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the amount of income recognized in the period related to the CMS Risk Adjustment Data Validation ("RADV") audit reserve release.

No definition available.

Name:	cvh_CmsRiskAdjustmentDataValidationAuditReserve
Namespace Prefix:	cvh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Exchange ratio used in the calcuation of consideration to be paid in connection with the proposed merger.

No definition available.

Name:	cvh_Exchangeratiousedincalcuationofmergerconsideration
Namespace Prefix:	cvh_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Percent of Favorable Votes Regarding Merger

No definition available.

Name:	cvh_PercentOfFavorableVotesRegardingMerger
Namespace Prefix:	cvh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The per share amount of cash to be received by shareholders upon completion of the proposed merger.

No definition available.

Name:	cvh_Pricepersharepaidincash
Namespace Prefix:	cvh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Ratio of shares voting in favor of Merger to outstanding shares of stock

No definition available.

Name:	cvh_RatioOfSharesVotingInFavorOfMerger
Namespace Prefix:	cvh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	cvh_ScheduleOfRevenueRecognitionRadvReleaseAbstract
Namespace Prefix:	cvh_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Shares of Common Stock Held by Voting Stockholder Special Meeting

No definition available.