Fair Value Measurements - Additional Information (Detail) (USD $)						1 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 2.58% Senior Euro Notes	Jun. 30, 2013 Senior Notes	Jun. 30, 2013 4.2% Senior Notes	Apr. 30, 2013 Matcon Group Limited	Jun. 30, 2013 Matcon Group Limited	Jul. 20, 2012 Matcon Group Limited
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Payment under contingent consideration arrangement						$ 3,800,000
Contingent consideration fair value	4,890,000	9,043,000					4,900,000	8,400,000
Stated interest rate			2.58%	4.50%	4.20%
Fair value of our revolving facility and senior debt	837,200,000
Carrying value of our revolving facility and senior debt	$ 808,500,000