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Change of Control (Details) (USD $)		9 Months Ended
	Jul. 23, 2012 day	Sep. 30, 2012 Icahn	May 07, 2012 Icahn
Change of Control
Price per share			$ 30
Number of non-transferable contingent cash payments right for each Share (in shares)			1
Ownership percentage held by controlling stockholder		82.00%
Offer price per Share on restricted stock awards vested in 2012		$ 30
Number of non-transferable contingent cash payments right for each restricted stock awards vested in 2012 (in shares)		1
Marketing period for third parties to acquire entity (in days)	60

X

- Definition

Represents the entity's closing stock price.

+ References

No definition available.

+ Details

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Namespace Prefix:	cvi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the percentage of ownership interest held by the majority shareholder.

+ References

No definition available.

+ Details

Name:	cvi_MajorityShareholderOwnershipPercentage
Namespace Prefix:	cvi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the marketing period in days for third parties to acquire entity.

+ References

No definition available.

+ Details

Name:	cvi_MarketingPeriodForThirdPartiesToAcquireEntity
Namespace Prefix:	cvi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of non-transferable contingent cash payments right for each restricted stock awards vested.

+ References

No definition available.

+ Details

Name:	cvi_NumberOfNonTransferableContingentCashPaymentsRightForEachRestrictedStockAwardsVested
Namespace Prefix:	cvi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of non-transferable contingent cash payments right for each Share.

+ References

No definition available.

+ Details

Name:	cvi_NumberOfNonTransferableContingentCashPaymentsRightForEachShare
Namespace Prefix:	cvi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the offer price per share on restricted stock awards vested.

+ References

No definition available.

+ Details

Name:	cvi_OfferPricePerShareOnRestrictedStockAwardsVested
Namespace Prefix:	cvi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	cvi_ScheduleOfChangeInControlLineItems
Namespace Prefix:	cvi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration