Name:	crzo_ContingentConsiderationArrangementPotentialAdditionalAnnualPaymentsforAcquisition
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Balance Type:	credit
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Threshold price per Bbl for additional payments for acquisition. If the average EIA WTI price per barrel is above this amount, the Company will make additional payments for the acquisition.

No definition available.

Name:	crzo_ContingentConsiderationArrangementThresholdPricePerBblForAdditionalPaymentsForAcquisition
Namespace Prefix:	crzo_
Data Type:	us-types:perUnitItemType
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Period Type:	duration

The fair value of the contingent consideration on the date of the acquisition.

No definition available.

Name:	crzo_ContingentConsiderationLiabilityAcquisitionDateFairValue
Namespace Prefix:	crzo_
Data Type:	xbrli:monetaryItemType
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Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

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

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Data Type:	xbrli:decimalItemType
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For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

Name:	us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of liability recognized arising from contingent consideration in a business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

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The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

No definition available.

Name:	us-gaap_DerivativeAverageCapPrice
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
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Period Type:	instant

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

No definition available.

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

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.

No definition available.

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

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Namespace Prefix:
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Name:	crzo_DerivativePositionPeriodAxis=crzo_DerivativePositionsYearTwoThousandEighteenMember
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_EnergyAxis=us-gaap_CrudeOilMember
Namespace Prefix:
Data Type:	na
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Period Type:

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_SwapMember
Namespace Prefix:
Data Type:	na
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Name:	crzo_SignificantAcquisitionandDisposalByTransactionAxis=crzo_ExLAcquisitionMember
Namespace Prefix:
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