Restructuring and other - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012 Employees	Sep. 30, 2011 Employees	Sep. 30, 2012 Employees	Sep. 30, 2011 Employees
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 2,280,000	$ 604,000	$ 4,530,000	$ 2,316,000
Restructuring and severance charges	1,500,000	300,000	2,500,000	1,600,000
Reduction in number of head counts	59	12	103	41
Retention expense	200,000		678,000
Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Facilities reduction and other costs	300,000		300,000
Prism, Entrac, and Streamline [Member]
Restructuring Cost and Reserve [Line Items]
Integration expense		300,000		400,000
Cretaprint And Prism [Member]
Restructuring Cost and Reserve [Line Items]
Integration expense	$ 300,000		$ 1,000,000