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Financial Instruments - Effect of the Company's Derivative Instruments on Net Income (Loss) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Interest Expense [Member]
     
Derivative Instruments, Gain (Loss) Recognized in OCI, (Effective Portion) [Line Items]      
Amount of Gain (Loss) Reclassified from Accumulated OCI (Effective Portion) $ (0.4) $ (0.9) $ (0.1)
Interest Rate Products [Member]
     
Derivative Instruments, Gain (Loss) Recognized in OCI, (Effective Portion) [Line Items]      
Derivative Instruments, Gain (Loss) Recognized in OCI, (Effective Portion) $ (13.9) $ (8.3) $ (3.6)