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Borrowings - Additional Information (Detail) (Five-year Senior Unsecured Notes [Member], USD $)
In Millions, unless otherwise specified
1 Months Ended
Jul. 31, 2013
Sep. 30, 2013
Aug. 31, 2013
Five-year Senior Unsecured Notes [Member]
     
Debt Instrument [Line Items]      
Senior unsecured notes $ 55.0   $ 8.3
Senior unsecured notes, term 5 years    
Senior unsecured notes aggregate amount   63.25  
Senior unsecured notes, interest rate 6.375%    
Net proceeds from notes after issuance cost $ 60.4