Condensed Consolidating Financial Information (Narrative) (Details)	Jun. 30, 2018
Condensed Consolidating Financial Information [Abstract]
Voting interest of the subsidiary owned by the registrant	100.00%

The percentage of voting interest of a subsidiary guarantor owned by the reporting entity which is considered to determine whether the reporting entity is required to provide condensed consolidating financial information.

No definition available.

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