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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, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Feb. 28, 2019 EUR (€) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payments of business, net of cash acquired |  |  |  | $ 18,894 | $ 0 |  |  |
Goodwill |  |  |  | 25,278 |  |  |  | $ 15,621
Intangibles - net |  |  |  | $ 15,216 |  |  |  | $ 8,458
SubCon [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, percentage of voting interests acquired |  | 100.00% |  |  |  |  | 100.00% |
Total purchase price |  | $ 10,200 |  |  |  |  |  |
Payments of business, net of cash acquired |  | 1,800 |  |  |  |  |  |
Goodwill |  | 7,000 |  |  |  |  |  |
Intangibles - net |  | $ 4,700 |  |  |  |  |  |
Useful lives |  | 15 years | 15 years |  |  |  |  |
Purchase price estimated liability | € |  |  |  |  |  |  | € 0.9 |
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 |  | $ 900 |  |  |  |  |  |
MICOS Telecom [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Total purchase price | $ 8,800 |  |  |  |  |  |  |
Payments of business, net of cash acquired | 500 |  |  |  |  |  |  |
Goodwill | 3,400 |  |  |  |  |  |  |
Intangibles - net | $ 3,500 |  |  |  |  |  |  |
Useful lives | 15 years |  |  |  |  |  |  |
Business combination intangible assets included in goodwill |  |  |  |  |  | $ 3,500 |  |
Preliminary purchase price of plant and equipment | $ 1,900 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |

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