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Acquisitions - Acquired Identifiable Intangible Assets (Detail) - USD ($) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
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Mar. 02, 2020 | Jan. 08, 2020 | Nov. 02, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |
Fair value of intangible assets acquired |  |  |  |  | $ 1,568
Packet Host, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of intangible assets acquired |  |  |  | $ 58,500 |
Packet Host, Inc. | Trade names |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of intangible assets acquired | $ 1,300 |  |  |  |
Acquired intangible assets, estimated useful lives (years) | 3 years |  |  |  |
Weighted-average estimated useful lives (years) | 3 years |  |  |  |
Packet Host, Inc. | Customer relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of intangible assets acquired | $ 52,100 |  |  |  |
Acquired intangible assets, estimated useful lives (years) | 10 years |  |  |  |
Weighted-average estimated useful lives (years) | 10 years |  |  |  |
Packet Host, Inc. | Technology-Based Intangible Assets |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of intangible assets acquired | $ 5,100 |  |  |  |
Acquired intangible assets, estimated useful lives (years) | 3 years |  |  |  |
Weighted-average estimated useful lives (years) | 3 years |  |  |  |
Axtel |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of intangible assets acquired |  |  |  | 22,750 |
Axtel | Customer relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of intangible assets acquired |  | $ 22,750 |  |  |
Acquired intangible assets, estimated useful lives (years) |  | 15 years |  |  |
Weighted-average estimated useful lives (years) |  | 15 years |  |  |
Bell Acquisition |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of intangible assets acquired |  |  |  | $ 75,631 |
Bell Acquisition | Customer relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of intangible assets acquired |  |  | $ 75,631 |  |
Acquired intangible assets, estimated useful lives (years) |  |  | 15 years |  |
Weighted-average estimated useful lives (years) |  |  | 15 years |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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