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Business Combinations - Additional Information (Detail) $ in Thousands, € in Millions |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2019 USD ($) | Feb. 28, 2019 USD ($) | Feb. 28, 2019 EUR (€) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Payments of business, net of cash acquired |  |  |  | $ 0 | $ 18,894 |
Goodwill |  |  |  | 27,689 |  | $ 27,840
Intangibles - net |  |  |  | 13,926 |  | $ 15,116
SubCon [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  | 100.00% |  |  |  |
Total purchase price |  | $ 10,100 |  |  |  |
Payments of business, net of cash acquired |  | 1,900 |  |  |  |
Goodwill |  | 6,600 |  |  |  |
Intangibles - net |  | 4,700 |  |  |  |
Purchase price estimated contingent liability |  | $ 600 |  |  |  |
Potential maximum payment | € |  |  | € 4.0 |  |  |
Remeasurement period |  | 4 years | 4 years |  |  |
SubCon [Member] | Other Noncurrent Liabilities [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination earnout liability |  |  |  | $ 200 |  |
SubCon [Member] | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Useful lives |  | 10 years | 10 years |  |  |
SubCon [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Useful lives |  | 11 years | 11 years |  |  |
MICOS Telecom [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Total purchase price | $ 8,800 |  |  |  |  |
Payments of business, net of cash acquired | 500 |  |  |  |  |
Goodwill | 5,600 |  |  |  |  |
Intangibles - net | $ 3,400 |  |  |  |  |
Useful lives | 12 years |  |  |  |  |
Percentage of remaining voting interests deferred consideration payable | 10.00% |  |  |  |  |
MICOS Telecom [Member] | Other Noncurrent Liabilities [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination hold-back liability | $ 1,500 |  |  |  |  |
Business combination hold-back liability payable term | 2 years |  |  |  |  |
Business combination deferred consideration | $ 900 |  |  |  |  |

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