Changes in Fair Value of Contingent Consideration Recognized in General and Administrative Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 16, 2011 Streamline [Member]	Jul. 25, 2011 Entrac [Member]	Dec. 06, 2011 Alphagraph [Member]	Jan. 10, 2012 Cretaprint [Member]	Apr. 05, 2012 F X Colors [Member]	Apr. 10, 2012 Metrics [Member]
Business Acquisition, Contingent Consideration [Line Items]
Deferred compensation cost dependent on future employment	$ 200	$ 678
Changes in valuation		(476)	1,538
Payment		(382)	(2,125)
Foreign currency adjustment	(362)	(362)	(91)
Fair value of contingent consideration	$ 30,379	$ 30,379	$ 8,704	$ 2,744	$ 1,320	$ 2,730	$ 2,588	$ 16,445	$ 190	$ 5,582