Restructuring and Other - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013 Employees	Jun. 30, 2012 Employees	Jun. 30, 2013 Employees	Jun. 30, 2012 Employees	Dec. 31, 2012
Restructuring and other charges	$ 1,235,000	$ 1,167,000	$ 3,137,000	$ 2,250,000
Restructuring and severance charges	400,000	300,000	1,400,000	1,100,000
Reductions in number of head count	28	16	62	44
Retention expense	200,000	200,000	465,000	456,000	907,000
Facilities relocation expenses	100,000		200,000
Metrics, Cretaprint, and Prism acquisitions [Member]
Integration expense		700,000		800,000
Metrics, Cretarpint, OPS, and Technique [Member]
Integration expense	$ 500,000		$ 1,100,000