Financial Instruments - Additional Information (Detail) (USD $)					6 Months Ended					6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Fair Value, Inputs, Level 2	Dec. 31, 2012 Fair Value, Inputs, Level 2	Jun. 30, 2013 Five-Year Credit Facility Expiring In October 2016	Jun. 30, 2013 Fair Value, Measurements, Recurring Fair Value, Inputs, Level 3	Dec. 31, 2012 Fair Value, Measurements, Recurring Fair Value, Inputs, Level 3	Jun. 30, 2013 Option currency contracts	Dec. 31, 2012 Option currency contracts	Jun. 30, 2013 Interest rate swap contract
Derivative [Line Items]
Notional value of derivative contracts								$ 158,800,000	$ 128,100,000	$ 250,000,000
Fixed-rate notes interest percentage										2.875%
Fixed-rate notes due date										2016
Fair value of contingent consideration						79,800,000	77,100,000
Fair value of commercial paper borrowings	76,500,000	0
Line of credit facility, borrowing capacity					600,000,000
Line of credit facility, term, in years					5 years
Line of credit facility, expiration date					2016-10
Fair value of long-term debt			$ 1,469,300,000	$ 1,532,200,000