Accrued and unpaid interest for the last interest payment date to the redemption date

No definition available.

Name:	crzo_Accruedinterestpaidassociatedwithredemptionofdebt
Namespace Prefix:	crzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The percentage to be added to the adjusted LIBO rate in determining the base interest rate.

+ References

No definition available.

+ Details

Name:	crzo_AdjustedLiboRatePlusPercentage
Namespace Prefix:	crzo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Current Ratio

+ References

No definition available.

+ Details

Name:	crzo_CurrentRatio
Namespace Prefix:	crzo_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow associated with the redemption of senior debt, which also includes the premium paid to redeem the senior debt

+ References

No definition available.

+ Details

Name:	crzo_DebtInstrumentRedemptionCashConsideration
Namespace Prefix:	crzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage to be added to the Federal Funds Effective Rate in determining the base interest rate.

+ References

No definition available.

+ Details

Name:	crzo_FederalFundsRatePlusPercentage
Namespace Prefix:	crzo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility elected by the Company, considering any current restrictions on the amount that could be borrowed, but without considering any amount currently outstanding under the credit facility.

+ References

No definition available.

+ Details

Name:	crzo_LineofCreditFacilityElectedBorrowingCapacity
Namespace Prefix:	crzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The margin added to the base rate, where the base rate is defined as the greatest of the prime rate, the federal funds rate plus 0.50% and the adjusted LIBO rate plus 1.00%, to determine the interest rate for base rate loans.

+ References

No definition available.

+ Details

Name:	crzo_Marginforbaserateloans
Namespace Prefix:	crzo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The margin added to an adjusted LIBO rate to determine the interest rate for Eurodollar loans.

+ References

No definition available.

+ Details

Name:	crzo_Marginforeurodollarloans
Namespace Prefix:	crzo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the threshold of the pre-tax SEC PV-10 reserve value that if exceeded, a mortgage lien on the oil and natural gas property exists as collateral for borrowings under the Senior Secured Revolving Credit Facility.

+ References

No definition available.

+ Details

Name:	crzo_PreTaxSECPV10ReserveValuePercentage
Namespace Prefix:	crzo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Ratio of Total Debt to EBITDA

+ References

No definition available.

+ Details

Name:	crzo_RatioOfTotalDebtToEbitda
Namespace Prefix:	crzo_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The price at which the Company may redeem the debt, stated as a percentage of the principal amount.

+ References

No definition available.

+ Details

Name:	crzo_RedemptionPricePercentageOfPrincipalAmount
Namespace Prefix:	crzo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: 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))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
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

+ 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

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share.

+ References

No definition available.

+ Details

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

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

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

- Details

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

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

Name:	crzo_RatioofoutstandingborrowingsandlettersofcredittolendercommitmentsAxis=crzo_Lessthan25percentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	crzo_RatioofoutstandingborrowingsandlettersofcredittolendercommitmentsAxis=crzo_Greaterthanorequalto90percentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Long-Term Debt (Narrative) (Details) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended			6 Months Ended
Long-Term Debt (Narrative) (Details) $ in Thousands	May 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Rate	Jun. 30, 2017 USD ($)	May 04, 2018 USD ($)	May 03, 2018	Jan. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount				$ 320,000
Cash paid for debt redemption				336,900
Redemption Premium				6,000
Accrued interest paid associated with redemption of debt				10,900
Loss on extinguishment of debt			$ 0		$ 0	$ 8,676	$ 0
Write off of Deferred Debt Issuance Cost				$ 2,700
Redemption price, percentage of principal amount		101.875%	101.875%			101.875%
Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity		$ 1,000,000	$ 1,000,000			$ 1,000,000		$ 1,000,000		$ 830,000	$ 900,000
Line of Credit Facility, Elected Borrowing Capacity		900,000	900,000			900,000		$ 900,000		$ 800,000
Line of credit facility amount outstanding		$ 485,000	$ 485,000			$ 485,000					291,300
Debt, Weighted Average Interest Rate		3.74%	3.74%			3.74%
Ratio of total debt to EBITDA						2.53
Current Ratio		1.49	1.49			1.49
Pre-Tax SEC PV10 Reserve Value Percentage \| Rate						90.00%
Federal funds rate plus percentage		0.50%	0.50%			0.50%
Adjusted LIBO rate plus percentage		1.00%	1.00%			1.00%
Senior Secured Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Margin for eurodollar loans		2.50%		3.00%
Ratio of total debt to EBITDA						4.00
Senior Secured Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Margin for eurodollar loans		1.50%		2.00%
Current Ratio		1.00	1.00			1.00
7.50% Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.50%	7.50%			7.50%
Long term debt		$ 130,000	$ 130,000			$ 130,000					450,000
8.25% Senior Notes [Member]
Debt Instrument [Line Items]
Long term debt		250,000	250,000			250,000					250,000
Other Long Term Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage									4.375%
Cash paid for debt redemption	$ 4,500
Accrued interest paid associated with redemption of debt	$ 100
Redemption price, percentage of principal amount									100.00%
Long term debt		$ 0	$ 0			$ 0					$ 4,425
Less than 25 percent [Member] \| Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Margin for eurodollar loans		1.50%
Line of Credit Facility, Commitment Fee Percentage		0.375%
Margin for base rate loans		0.50%
Greater than or equal to 90 percent [Member] \| Senior Secured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Margin for eurodollar loans		2.50%
Line of Credit Facility, Commitment Fee Percentage		0.50%
Margin for base rate loans		1.50%