Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities - Aggregate Interest Rate Swaps and Fair Value of Liabilities Outstanding (Detail)

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Derivative Instruments and Hedging Activities - Aggregate Interest Rate Swaps and Fair Value of Liabilities Outstanding (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]    
Aggregate Notional Amounts $ 593.7 $ 610.1
Interest Rate Swaps [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Aggregate Notional Amounts 140.0 140.0
Average Swap Rate 2.78% 2.78%
Aggregate Fair Value    $ (2.0)
Maturity Dates Jul. 31, 2013 Jul. 31, 2013