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Notes Payable - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Collateral Account used for future payments $ 0.1 $ 25.0 $ 0
Principal and interest payments 0.1 25.0 0
13% Senior First Lien Notes [Member]
     
Debt Instrument [Line Items]      
Note issued 110.0    
Notes maturity date Mar. 19, 2030    
Cash interest paid on Notes 9.7 3.7 0
Principal payments 36.3 2.1 0
13% Senior Second Lien Notes [Member]
     
Debt Instrument [Line Items]      
Note issued 20.0    
Notes maturity date Mar. 19, 2030    
PIK Notes [Member]
     
Debt Instrument [Line Items]      
Note issued 13.9 8.3 0
Runoff Notes [Member]
     
Debt Instrument [Line Items]      
Outstanding amounts of notes $ 105.5 $ 136.3 $ 0