Revenues by Groups of Similar Products and Services (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Entity Wide Information Revenue From External Customer [Line Items]
Net Revenues	$ 336,461	$ 335,392	$ 1,020,447	$ 1,039,602
Operating Segments | UC Group Systems
Entity Wide Information Revenue From External Customer [Line Items]
Net Revenues	221,370	225,780	686,795	717,982
Operating Segments | UC Personal Devices
Entity Wide Information Revenue From External Customer [Line Items]
Net Revenues	56,920	45,731	157,014	134,095
Operating Segments | UC Platform
Entity Wide Information Revenue From External Customer [Line Items]
Net Revenues	$ 58,171	$ 63,881	$ 176,638	$ 187,525