Debt - Financial Covenant Table (Details)	Sep. 30, 2013
Maximum
Line of Credit Facility [Line Items]
Ratio of total debt to EBITDAX	4.0
Minimum
Line of Credit Facility [Line Items]
Ratio of current assets to liabilities, as defined in the credit agreement	1.0

Line of Credit Facility, Covenant Terms, Ratio of Total Debt to Earnings Before Interest, Taxes, Depreciation, Depletion, Amortization and Exploration Expense

No definition available.

Name:	fang_LineOfCreditFacilityCovenantTermsRatioOfTotalDebtToEarningsBeforeInterestTaxesDepreciationDepletionAmortizationAndExplorationExpense
Namespace Prefix:	fang_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant