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Discontinued Operations - Additional Information (Details) (USD $)
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3 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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| Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |
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| Gain from sale of discontinued operations, net of taxes |
$ 0 |
$ 0 |
| Additional cash consideration payable to Polycom as a result of EWS disposition | Maximum |
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| Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |
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| Additional cash consideration payable over the next two years subject to certain conditions, including meeting certain agreed-upon EBITDA-based milestones |
$ 25,000,000 |
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