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Financing Arrangements - Schedule of Subordinate Note Redemption (Detail)
 12 Months Ended
Dec. 31, 2014
Debt Instrument Redemption [Line Items]  
Subordinated note redemption percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
3rd anniversary of the Initial Issue Date [Member]  
Debt Instrument Redemption [Line Items]  
Subordinated note redemption percentage 103.75%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodThreeMember
4th anniversary of the Initial Issue Date [Member]  
Debt Instrument Redemption [Line Items]  
Subordinated note redemption percentage 101.875%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodFourMember
5th anniversary of the Initial Issue Date and thereafter [Member]  
Debt Instrument Redemption [Line Items]  
Subordinated note redemption percentage 100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_DebtInstrumentRedemptionPeriodAxis
= us-gaap_DebtInstrumentRedemptionPeriodFiveMember