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Senior Secured Revolving Credit Facility (Detail) (Collateralized, $60 million senior secured revolving credit facility, USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Collateralized | $60 million senior secured revolving credit facility
   
Debt Instrument [Line Items]    
Opening balance   $ 50.0
Loans advanced 35.0 23.0
Loans repaid   (73.0)
Closing balance $ 35.0