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Discontinued Operations (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Feb. 22, 2013
Carrizo United Kingdom [Member]
Jun. 30, 2013
Carrizo United Kingdom [Member]
Mar. 31, 2013
Carrizo United Kingdom [Member]
Dec. 27, 2012
Carrizo United Kingdom [Member]
Feb. 22, 2013
Carrizo United Kingdom [Member]
Huntington Field Development Project Credit Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Percentage of non-operating working interest and overriding royalty interests                 15.00%  
Sale price           $ 184,000,000        
Deferred compensation expected to be received               18,500,000    
Line of credit facility amount outstanding                   55,000,000
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax 0 0 37,294,000 0            
Liabilities of disposal group, including discontinued operation 27,900,000   27,900,000              
Disposal Group, deferred consideration received             12,000,000      
Assets of discontinued operations $ 6,875,000   $ 6,875,000   $ 0