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Investments in Affiliates and Other Entities (Tables) | 9 Months Ended
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Sep. 30, 2023
Investments [Abstract] |
Schedule of Equity Investments | The following table presents Quanta’s equity investments by type (in thousands):
|  | September 30, 2023 |  | December 31, 2022
Equity method investments - integral unconsolidated affiliates |  | $ | 94,927 |  |  | $ | 101,251 |
Equity method investments - non-integral unconsolidated affiliates |  | 28,482 |  |  | 55,833 |
Marketable equity securities (1) |  | — |  |  | — |
Non-marketable equity securities |  | 53,246 |  |  | 54,134 |
Total equity investments |  | $ | 176,655 |  |  | $ | 211,218 |
(1) As of December 31, 2022, the fair value of Quanta’s investment in equity securities of Starry Group Holdings, Inc. (Starry) was zero, which was accounted for as an investment in marketable securities and included a loss of $91.5 million. During the three months ended September 30, 2023, a plan of reorganization in Starry’s bankruptcy proceeding pursuant to Chapter 11 of the U.S. Bankruptcy Code, as amended, went into effect and, as a result, the equity securities of Starry held by Quanta were cancelled.

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- Definition Tabular disclosure of investment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 321 -Publisher FASB -URI https://asc.fasb.org//321/tableOfContent Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Topic 325 -Publisher FASB -URI https://asc.fasb.org//325/tableOfContent + Details
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