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v3.20.1

Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disaggregation Of Revenue [Line Items] |  |
Revenue | $ 114,523 | $ 143,791
Reclassification of Property, Plant and Equipment to Other Assets [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 65,966 | 99,778
Subscriber Solutions & Experience [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 42,179 | 36,753
Traditional & Other Products [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 6,378 | 7,260
Network Solutions [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 97,372 | 125,822
Network Solutions [Member] | Reclassification of Property, Plant and Equipment to Other Assets [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 53,055 | 85,673
Network Solutions [Member] | Subscriber Solutions & Experience [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 39,983 | 34,719
Network Solutions [Member] | Traditional & Other Products [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 4,334 | 5,430
Services & Support [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 17,151 | 17,969
Services & Support [Member] | Reclassification of Property, Plant and Equipment to Other Assets [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 12,911 | 14,105
Services & Support [Member] | Subscriber Solutions & Experience [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 2,196 | 2,034
Services & Support [Member] | Traditional & Other Products [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | $ 2,044 | $ 1,830

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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