Fair Value Measurements - Additional Information (Detail) (USD $)						1 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 2.58% Senior Euro Notes, due June 2015	Dec. 06, 2010 Senior Notes	Dec. 09, 2011 4.2% Senior Notes, due December 2021	Apr. 30, 2013 Matcon Group Limited	Sep. 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
Contingent consideration for acquisition	4,890,000	3,528,000					4,900,000
Stated interest rate			2.58%	4.50%	4.20%
Fair value of our revolving facility and senior debt	792,200,000
Carrying value of our revolving facility and senior debt	$ 777,600,000