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Notes Payable - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mar. 19, 2012
Debt Instrument [Line Items]        
Outstanding amounts of notes $ 115.7   $ 136.3  
Principal payments 21.3   2.0  
Restricted cash held for notes payable 0   25.0  
13% Senior First Lien Notes [Member]
       
Debt Instrument [Line Items]        
Note issued       110.0
Cash interest payments on Notes 7.4      
Cash interest paid on Notes 3.7 0 3.7  
13% Senior Second Lien Notes [Member]
       
Debt Instrument [Line Items]        
Note issued       20.0
PIK Notes [Member]
       
Debt Instrument [Line Items]        
Note issued $ 9.0   $ 8.3