Debt instrument principal amount, accrued and unpaid interest percentage.

No definition available.

Name:	chpe_DebtInstrumentPrincipalAmountAccruedAndUnpaidInterestPercentage
Namespace Prefix:	chpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument redemption aggregate principal amount maximum percentage.

+ References

No definition available.

+ Details

Name:	chpe_DebtInstrumentRedemptionAggregatePrincipalAmountMaximumPercentage
Namespace Prefix:	chpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt Instrument, Redemption Period, After Equity Offering Closing

+ References

No definition available.

+ Details

Name:	chpe_DebtInstrumentRedemptionPeriodAfterEquityOfferingClosing
Namespace Prefix:	chpe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument, redemption price, percentage of aggregate principal amount of notes remains outstanding.

+ References

No definition available.

+ Details

Name:	chpe_DebtInstrumentRedemptionPricePercentageOfAggregatePrincipalAmountOfNotesRemainsOutstanding
Namespace Prefix:	chpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Estimated offering costs of debt.

+ References

No definition available.

+ Details

Name:	chpe_EstimatedOfferingCostsOfDebt
Namespace Prefix:	chpe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Minimum percentage of principal holders required to declare outstanding amounts due.

+ References

No definition available.

+ Details

Name:	chpe_MinimumPercentageOfPrincipalHoldersRequiredToDeclareOutstandingAmountsDue
Namespace Prefix:	chpe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of contractual interest expense on prepetition liabilities not included in the statement of operations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6918054&loc=d3e56068-112765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 852
-SubTopic 10
-Section 55
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56145-112766

+ Details

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

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

+ Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=chpe_EightPointSevenFivePercentSeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt (Senior Notes) (Details) - USD ($)		3 Months Ended	12 Months Ended
Debt (Senior Notes) (Details) - USD ($)	Jun. 29, 2018	Mar. 21, 2017	Dec. 31, 2019
Senior Notes
Debt Instrument [Line Items]
Stated interest rate			8.75%
Interest expense		$ 22,582,000
8.75% Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount	$ 300,000,000
Estimated offering costs	7,337,000
Net proceeds from issuance of debt	$ 292,663,000
Stated interest rate	8.75%
Aggregate principal amount of notes (as a percent)			35.00%
Aggregate principal amount of notes remains outstanding (as a percent)			60.00%
Redemption period			180 days
Aggregate principal amount of outstanding notes (as a percent)			25.00%
Principal amount accrued and unpaid interest (as a percent)			101.00%
8.75% Senior Notes \| Low
Debt Instrument [Line Items]
Redemption price, percentage to principal amount			100.00%
8.75% Senior Notes \| Prior to July 15, 2020
Debt Instrument [Line Items]
Redemption price, percentage to principal amount			108.75%