Organization and Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, $ in Millions		9 Months Ended
	May 17, 2016	Sep. 30, 2016	Sep. 30, 2015	Mar. 30, 2015
Network connectivity services
Organization and Basis of Presentation [Line Items]
Period to recognize unbilled revenue		Billing period spans more than one month, earned but unbilled revenues are recognized as revenue
PCS
Organization and Basis of Presentation [Line Items]
Revenue recognized ratably over maintenance period		15 months
2.50% Convertible Notes
Organization and Basis of Presentation [Line Items]
Convertible notes stated interest percentage		2.50%	2.50%	2.50%
Maturity date of convertible senior notes		Apr. 01, 2022
Proposed Merger by NICE-Systems Ltd
Organization and Basis of Presentation [Line Items]
Merger agreement date		May 17, 2016
Right to receive cash equal to per share	$ 14.00
Termination fee	$ 34.1
Proposed Merger by NICE-Systems Ltd | Outstanding and Vested Restricted Stock Unit or Option
Organization and Basis of Presentation [Line Items]
Right to receive cash equal to per share	$ 14.00