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Financing Arrangements - Additional Information (Detail) - USD ($)
Jan. 05, 2015
Dec. 19, 2014
Jan. 30, 2014
Affiliates of KKR [Member] | Redeemable Convertible Series B Preferred Stock [Member]      
Debt Instrument [Line Items]      
Preferred stock, shares issued   200,000  
Financing Agreement [Member]      
Debt Instrument [Line Items]      
Loans outstanding $ 0    
7.50% Subordinated Notes [Member]      
Debt Instrument [Line Items]      
Principal available     $ 150,000,000
Debt instrument, interest rate, stated percentage     7.50%