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Schedule of Derivative (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Derivatives, Fair Value [Line Items]  
Amount $ 151,500invest_DerivativeNotionalAmount
Fair Value 1,722us-gaap_DerivativeFairValueOfDerivativeNet
Fitch, BBB+ Rating [Member]  
Derivatives, Fair Value [Line Items]  
Amount 145,300invest_DerivativeNotionalAmount
/ us-gaap_CreditRatingFitchAxis
= us-gaap_FitchBBBPlusRatingMember
Fair Value 2,364us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_CreditRatingFitchAxis
= us-gaap_FitchBBBPlusRatingMember
Weighted Average Years to Maturity 8 years
Fitch, BBB- Rating [Member]  
Derivatives, Fair Value [Line Items]  
Amount 6,200invest_DerivativeNotionalAmount
/ us-gaap_CreditRatingFitchAxis
= us-gaap_FitchBBBMinusRatingMember
Fair Value $ (642)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_CreditRatingFitchAxis
= us-gaap_FitchBBBMinusRatingMember
Weighted Average Years to Maturity 11 years