Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities - Additional Information (Detail)

v2.4.0.6
Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative liability fair value 12.9 6.6
Derivative asset fair value 3.0 1.2
Credit Facility [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Variable rate basis LIBOR  
Average effective fixed rate on notional balances, minimum 4.28%  
Average effective fixed rate on notional balances, maximum 5.28%  
Credit Facility [Member] | Minimum [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Interest rate spread on variable rate 1.50%  
Credit Facility [Member] | Maximum [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Interest rate spread on variable rate 2.50%  
Prior Credit Facility [Member] | Term Loan [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Termination date March 2011  
Interest rate swaps [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative remaining maturity period 4 months  
Number of derivative instruments held 4  
Derivative aggregate notional amounts 140.0  
Weighted average fixed interest rate on notional amounts 2.78%  
Interest rate applicable on interest rate swap agreements for stipulated period One month LIBOR rate  
Inception date of interest rate swap agreements Aug. 31, 2009  
Effective date of interest rate swap agreements Dec. 31, 2009  
Expiration date of interest rate swap agreements Jul. 31, 2013  
Payment of interest period Less than a four- year period  
Derivative liability fair value 1.2 2.0
Foreign exchange currency contracts [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative aggregate notional amounts 549.9  
Derivative liability fair value 11.7 4.6
Derivative asset fair value 3.0 1.2
Foreign exchange currency contracts [Member] | Derivatives designated as cash flow hedging instruments [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative remaining maturity period 12 months  
Derivative aggregate notional amounts 249.8 256.9
Derivative liability fair value 9.6 3.3
Derivative asset fair value 2.7 0.5
Foreign exchange forward contracts [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative maximum remaining maturity period 12 months 12 months
Freestanding derivatives [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative average remaining maturity period 1 month 1 month
Foreign currency option contracts [Member]
    
Derivative Instruments, Gain (Loss) [Line Items]    
Number of derivative instruments held 0 0