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Stock Based Compensation (Details 6) (Deferred Performance Shares, USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Deferred Performance Shares
Deferred Compensation Plan
Number of common stock deferred into the rabbi trust (in shares)	534,174
Number of shares sold	0
Increase in rabbi trust deferred compensation liability	$ (9.3)

X

- Definition

Number of shares of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees. Shares have been earned but not distributed.

+ References

No definition available.

+ Details

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Namespace Prefix:	cog_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	cog_DeferredCompensationPlanAbstract
Namespace Prefix:	cog_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration