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Derivative Instruments and Hedging Activities - Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities (Detail) (Not Designated as Hedging Instruments [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Not Designated as Hedging Instruments [Member] |  |  |  |
Derivative Asset [Abstract] |  |  |  |
Gross amounts recognized | $ 14,020 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | $ 13,203 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Gross amounts offset | 0 us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | (222)us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Net amounts presented in the Consolidated Balance Sheets | 14,020 us-gaap_DerivativeAssets / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 12,981 us-gaap_DerivativeAssets / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Gross amounts not offset | 0 us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1] | 0 us-gaap_DerivativeAssetNotSubjectToMasterNettingArrangement / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1]
Net Amount | 14,020 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 12,981 us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Derivative Liability [Abstract] |  |  |  |
Gross amounts recognized | 13,979 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 13,175 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Gross amounts offset | 0 us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | (222)us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Net amounts presented in the Consolidated Balance Sheets | 13,979 us-gaap_DerivativeLiabilities / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | 12,953 us-gaap_DerivativeLiabilities / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Gross amounts not offset | (12,498)us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1] | (12,059)us-gaap_DerivativeLiabilityNotSubjectToMasterNettingArrangement / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | [1]
Net Amount | $ 1,481 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  | $ 894 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
[1] | Amounts represent posted collateral.

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