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Financial Instruments - Information Regarding Swaps (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Notional amount of interest rate derivatives $ 631.1 $ 631.4
Other Assets [Member]
    
Derivative [Line Items]    
Asset 2.1 2.8
Liability      
Accounts Payable [Member]
    
Derivative [Line Items]    
Asset      
Liability (5.5) (6.0)
Interest Rate Swaps One [Member]
    
Derivative [Line Items]    
Maturity Date Jun. 28, 2014  
Notional amount of interest rate derivatives 100.0  
Counterparty Pays Variable Rate 1 Month LIBOR  
Fixed Rate 1.00%  
Asset 0 0
Liability (0.2) (0.4)
Interest Rate Swaps Two [Member]
    
Derivative [Line Items]    
Maturity Date Jun. 01, 2015  
Notional amount of interest rate derivatives 50.0  
Counterparty Pays Variable Rate 1 Month LIBOR  
Fixed Rate 0.60%  
Asset 0 0
Liability (0.2) (0.2)
Interest Rate Swaps Three [Member]
    
Derivative [Line Items]    
Maturity Date Jul. 01, 2015  
Notional amount of interest rate derivatives 100.0  
Counterparty Pays Variable Rate 1 Month LIBOR  
Fixed Rate 0.50%  
Asset 0 0
Liability (0.4) (0.4)
Interest Rate Swaps Four [Member]
    
Derivative [Line Items]    
Maturity Date Sep. 01, 2017  
Notional amount of interest rate derivatives 81.1  
Counterparty Pays Variable Rate 1 Month LIBOR  
Fixed Rate 2.80%  
Asset 0 0
Liability (4.7) (5.0)
Interest Rate Swaps Five [Member]
    
Derivative [Line Items]    
Maturity Date Jan. 02, 2018  
Notional amount of interest rate derivatives 100.0  
Counterparty Pays Variable Rate 1 Month LIBOR  
Fixed Rate 0.90%  
Asset 1.3 1.4
Liability 0 0
Interest Rate Swaps Six [Member]
    
Derivative [Line Items]    
Maturity Date Feb. 01, 2019  
Notional amount of interest rate derivatives 100.0  
Counterparty Pays Variable Rate 1 Month LIBOR  
Fixed Rate 1.60%  
Asset 0.2 0.5
Liability 0 0
Interest Rate Swaps Seven [Member]
    
Derivative [Line Items]    
Maturity Date Feb. 01, 2019  
Notional amount of interest rate derivatives 100.0  
Counterparty Pays Variable Rate 1 Month LIBOR  
Fixed Rate 1.50%  
Asset 0.6 0.9
Liability $ 0 $ 0