Credit facility, outstanding borrowings, amount offset against accounts receivable derivative settlements.

No definition available.

Name:	chpe_CreditFacilityOutstandingBorrowingsAmountOffsetAgainstAccountsReceivableDerivativeSettlements
Namespace Prefix:	chpe_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Derivative settlements receivable.

+ References

No definition available.

+ Details

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

- Definition

Income statement impact of (payments for) proceeds from derivative instrument settlements.

+ References

No definition available.

+ Details

Name:	chpe_PaymentsForProceedsFromDerivativeInstrumentSettlements
Namespace Prefix:	chpe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

Name:	invest_DerivativeNonmonetaryNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:decimalItemType
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_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix:	us-gaap_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

- Definition

Average fixed price related to the group of price risk swap derivatives.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeSwapTypeAverageFixedPrice
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_SwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=chpe_DerivativeMaturingInTwoThousandEighteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=chpe_CrudeOilDerivativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=chpe_NaturalGasDerivativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=chpe_RenegotiatedDerivativeMaturingInTwoThousandEighteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=chpe_DerivativeMaturingInTwoThousandTwentyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=chpe_DerivativeMaturingInTwoThousandTwentyOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=chpe_EarlySettlementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=chpe_CrudeOilAndNaturalGasDerivativeContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Derivative instruments - Additional information (Details) bbl in Thousands, $ in Thousands			3 Months Ended	12 Months Ended
	Feb. 28, 2018 $ / bbl MBbls	Mar. 26, 2015 USD ($) MMBTU MBbls	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) bbl MMBTU $ / bbl $ / MMBTU	May 31, 2016 USD ($) MMBTU MBbls
Derivative [Line Items]
Receivable derivative settlements \| $					$ 157
Predecessor
Derivative [Line Items]
Receivable derivative settlements \| $						$ 119,303
Amount utilized to offset outstanding borrowings under credit facility \| $			$ 103,560	$ 103,560
Swaps \| Derivative Maturing in 2018
Derivative [Line Items]
Volume \| MBbls	1,086
Weighted average fixed price	54.80
Swaps \| Derivative Maturing in 2018 \| Crude Oil Derivative Contracts
Derivative [Line Items]
Weighted average fixed price					54.92
Volume \| bbl					2,116
Swaps \| Derivative Maturing in 2018 \| Natural Gas Derivative Contracts
Derivative [Line Items]
Weighted average fixed price \| $ / MMBTU					2.87
Volume \| MMBTU					10,491,000
Swaps \| Renegotiated Derivative Maturing in 2018
Derivative [Line Items]
Weighted average fixed price	60.00
Swaps \| Derivative Maturing in 2020
Derivative [Line Items]
Volume \| MBbls	543
Weighted average fixed price	46.26
Swaps \| Derivative Maturing in 2020 \| Crude Oil Derivative Contracts
Derivative [Line Items]
Weighted average fixed price					51.32
Volume \| bbl					1,004
Swaps \| Derivative Maturing in 2020 \| Natural Gas Derivative Contracts
Derivative [Line Items]
Weighted average fixed price \| $ / MMBTU					2.77
Volume \| MMBTU					3,600,000
Swaps \| Derivative Maturing in 2021
Derivative [Line Items]
Volume \| MBbls	543
Weighted average fixed price	44.34
Early settlement \| Crude Oil Derivative Contracts
Derivative [Line Items]
Volume \| MBbls		495				3,400
Early settlement \| Natural Gas Derivative Contracts
Derivative [Line Items]
Volume \| MMBTU		12,280,000				28,800,000
Early settlement \| Crude Oil and Natural Gas Derivative
Derivative [Line Items]
Settlement of non-hedge derivative instruments, net proceeds \| $		$ 15,395