Long-Term Debt--Phantom (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
9.875% Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Unamortized discount on 9.875% Senior Notes due 2020	4,861	$ 5,444
7.625% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Unamortized premium on 7.625% Senior Notes due 2022	4,869	$ 5,719
Mortgages [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Stated interest rate	2.54%
Maturity date	2021-08
Mortgages [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Stated interest rate	5.46%
Maturity date	2028-12
Secured Debt [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Stated interest rate	2.85%
Maturity date	2015-01
Secured Debt [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Stated interest rate	5.95%
Maturity date	2018-02

Debt Maturity Date, Month And Year

No definition available.

Name:	cpr_DebtMaturityDateMonthAndYear
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Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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- Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

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- Details

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