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Derivative Financial Instruments (Schedule of Notional Amounts and Estimated Fair Values of Commodity Derivative Positions) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 bbl | Dec. 31, 2013 bbl
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Financial Institution Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets Notional Amount | 470,000 cfr_DerivativeAssetsNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember | 356,000 cfr_DerivativeAssetsNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember
Oil/Natural Gas Derivative Assets, Estimated Fair Value | $ 14,357 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember | $ 1,004 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember
Oil/Natural Gas Derivative Liabilities Notional Amount | 197,000 cfr_DerivativeLiabilitiesNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember | 1,574,000 cfr_DerivativeLiabilitiesNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | (1,670)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember | (2,704)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember
Financial Institution Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets Notional Amount | 12,235,000 cfr_DerivativeAssetsNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember | 14,240,000 cfr_DerivativeAssetsNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember
Oil/Natural Gas Derivative Assets, Estimated Fair Value | 12,707 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember | 2,903 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember
Oil/Natural Gas Derivative Liabilities Notional Amount | 16,755,000 cfr_DerivativeLiabilitiesNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember | 22,510,000 cfr_DerivativeLiabilitiesNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | (4,095)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember | (3,212)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_FinancialInstitutionCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember
Customer Counterparties [Member] | Oil Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets Notional Amount | 197,000 cfr_DerivativeAssetsNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember | 1,574,000 cfr_DerivativeAssetsNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember
Oil/Natural Gas Derivative Assets, Estimated Fair Value | 1,670 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember | 2,818 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember
Oil/Natural Gas Derivative Liabilities Notional Amount | 470,000 cfr_DerivativeLiabilitiesNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember | 356,000 cfr_DerivativeLiabilitiesNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | (14,318)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember | (991)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_OilCommodityDerivativeMember
Customer Counterparties [Member] | Natural Gas Commodity Derivative [Member] |  |
Derivative Instruments [Line Items] |  |
Oil/Natural Gas Derivative Assets Notional Amount | 16,755,000 cfr_DerivativeAssetsNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember | 22,850,000 cfr_DerivativeAssetsNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember
Oil/Natural Gas Derivative Assets, Estimated Fair Value | 4,095 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember | 3,301 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember
Oil/Natural Gas Derivative Liabilities Notional Amount | 12,235,000 cfr_DerivativeLiabilitiesNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember | 13,900,000 cfr_DerivativeLiabilitiesNonmonetaryNotionalAmount / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember
Oil/Natural Gas Derivative Liabilities, Estimated Fair Value | $ (12,646)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember | $ (2,805)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue / us-gaap_CounterpartyNameAxis = cfr_CustomerCounterpartiesMember / us-gaap_DerivativeByNatureAxis = cfr_NaturalGasCommodityDerivativeMember

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- Definition Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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