Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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+ Details

Segment Reporting - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended				3 Months Ended					9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012 Healthcare Voice Solutions	Sep. 30, 2012 Supply Chain Voice Solutions	Sep. 30, 2012 Q1 Impairment [Member] Supply Chain Voice Solutions	Jul. 01, 2012 Q1 Impairment [Member] Supply Chain Voice Solutions	Apr. 01, 2012 Q1 Impairment [Member] Supply Chain Voice Solutions	Sep. 30, 2012 Q2 Impairment [Member] Healthcare Voice Solutions	Jul. 01, 2012 Q2 Impairment [Member] Healthcare Voice Solutions	Sep. 30, 2012 Q2 Impairment [Member] Healthcare Voice Solutions
Segment Reporting Disclosure [Line Items]
Number of reportable segments			3
Number Of Reporting Units			2
Impairment of goodwill	$ (200,000)	$ 0	$ 41,314,000	$ 0	$ 140,000	$ 41,174,000	$ 500,000	$ 25,800,000	$ 14,900,000		$ 800,000	$ 100,000
Goodwill, Impaired, Adjustment to Initial Estimate Amount										$ (700,000)
Number Of Major Customers			1	1
Percentage Of Revenues By Major Customers	23.00%	21.00%	20.00%	22.00%