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Borrowing Limits Amounts Outstanding and Amounts Available under Revolving Credit Facility (Detail) (Revolving Credit Facility, USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Oct. 04, 2013
Sep. 30, 2013
Revolving Credit Facility
       
Debt Instrument [Line Items]        
Revolving credit facility $ 120.0 $ 120.0 $ 120.0 $ 60.0
Outstanding revolving credit facility 43.7 60.2   43.6
Available revolving credit facility $ 76.3 $ 59.8   $ 16.4