Restructuring, Impairment and Other Charges - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring charges recorded			$ 1,200,000	$ 1,100,000
Acquisition cost			200,000
Restructuring and other charges recorded	882,000	1,297,000	1,216,000	2,021,000
Anticipated payment of accruals related to employee termination costs and vacated facilities	2,723,000	3,195,000	2,723,000	3,195,000	2,807,000	3,794,000
Accrued restructuring	1,548,000		1,548,000		1,606,000
Restructuring and related activities amount expected to be utilized in next fiscal year	1,200,000		1,200,000
GLC and GES Segments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges paid			1,200,000
GLC [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs			600,000
Restructuring charges paid				1,700,000
Technical Staff [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reduction, positions			13	12
Sales Staff [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reduction, positions			1	8
Administrative Staff [Member]
Restructuring Cost and Reserve [Line Items]
Workforce reduction, positions				7
Workforce Reductions [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges recorded			1,000,000	900,000
Vacated Facility [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs			100,000	200,000
VSI Acquisition [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs			100,000
VSI Acquisition [Member] | GES [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs			300,000
E5 Global Holdings, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Reduction in expenses related to fair value of contingent consideration liabilities			100,000
Productive Resources LLC (PRI) [Member]
Restructuring Cost and Reserve [Line Items]
Deferred consideration from acquisition	100,000		100,000
Strategic Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Other Restructuring Costs				900,000
Lease Obligation on Unused Facilities [Member]
Restructuring Cost and Reserve [Line Items]
Accrued restructuring	$ 1,500,000		$ 1,500,000
Restructuring reserve on unused facility expiration year			2026