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Freestanding Derivative Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Offsetting [Abstract]      
Derivative Asset $ 1.9us-gaap_DerivativeAssets $ 2.3us-gaap_DerivativeAssets  
Derivative liabilities 8.7us-gaap_DerivativeLiabilities 4.1us-gaap_DerivativeLiabilities  
Net settlement liability subject to master repurchase arrangements $ 5.5us-gaap_DerivativeFairValueOfDerivativeNet $ 0.1us-gaap_DerivativeFairValueOfDerivativeNet $ 0us-gaap_DerivativeFairValueOfDerivativeNet