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Financial Instruments - Effect of Company's Derivative Instruments on Net Loss (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Interest Rate Products [Member]
   
Derivative Instruments Gain Loss [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in OCI, (Effective Portion) $ (0.2) $ 1.8
Interest Expense [Member]
   
Derivative Instruments Gain Loss [Line Items]    
Amount of Gain (Loss) Reclassified from Accumulated OCI (Effective Portion) $ (0.1) $ (0.1)