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Revenue - Disaggregate of Revenue by Major Source (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 140,335 | $ 185,112 | $ 389,189 | $ 540,064
Access & Aggregation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 91,901 |  | 258,323 |
Customer Devices [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 38,552 | 35,582 | 103,213 | 105,683
Traditional & Other Products [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 9,882 | 13,571 | 27,653 | 39,640
Network Solutions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 121,043 | 145,467 | 341,359 | 444,607
Network Solutions [Member] | Access & Aggregation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 76,046 |  | 220,653 |
Network Solutions [Member] | Customer Devices [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 37,313 |  | 99,396 |
Network Solutions [Member] | Traditional & Other Products [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 7,684 |  | 21,310 |
Services & Support [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 19,292 | $ 39,645 | 47,830 | $ 95,457
Services & Support [Member] | Access & Aggregation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 15,855 |  | 37,670 |
Services & Support [Member] | Customer Devices [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 1,239 |  | 3,817 |
Services & Support [Member] | Traditional & Other Products [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 2,198 |  | $ 6,343 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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