Financial Instruments - Additional Information (Detail) (USD $)					1 Months Ended	9 Months Ended			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Fair Value, Inputs, Level 2	Dec. 31, 2012 Fair Value, Inputs, Level 2	Sep. 26, 2013 Five-Year Credit Facility Expiring In October 2016	Sep. 30, 2013 Five-Year Credit Facility Expiring In September 2018	Sep. 30, 2013 Fair Value, Measurements, Recurring Fair Value, Inputs, Level 3	Dec. 31, 2012 Fair Value, Measurements, Recurring Fair Value, Inputs, Level 3	Sep. 30, 2013 Interest rate swap contract	Sep. 30, 2013 Option currency contracts	Dec. 31, 2012 Option currency contracts
Derivative [Line Items]
Notional value of derivative contracts									$ 250,000,000	$ 150,000,000	$ 128,100,000
Fixed-rate notes interest percentage									2.875%
Fixed-rate notes due date									2016
Fair value of contingent consideration							86,800,000	77,100,000
Fair value of commercial paper borrowings	97,500,000	0
Line of credit facility, borrowing capacity					600,000,000	750,000,000
Line of credit facility, term, in years					5 years
Line of credit facility, expiration date					2016-10
Line of credit facility, expiration date						Sep. 26, 2018
Fair value of long-term debt			$ 1,454,200,000	$ 1,532,200,000