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Discontinued Operations (Narrative) (Details) (USD $)	3 Months Ended			0 Months Ended	3 Months Ended
Discontinued Operations (Narrative) (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Dec. 27, 2012	Feb. 22, 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 overriding royalty interests			15.00%			15.00%
Net proceeds received on sale					$ 144,100,000
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	37,294,000	0			37,300,000
Liabilities of disposal group, including discontinued operation					$ 30,500,000

Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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