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Goodwill and Identifiable Intangible Assets, Net - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Changes in the carrying amount of goodwill |  |
Balance at beginning of year | $ 332,447 | $ 235,182
Acquisitions and purchase price adjustments (See Note 4) | 88,335 | 97,265
Balance at end of period | 420,782 | 332,447
Mechanical Services Segment |  |
Changes in the carrying amount of goodwill |  |
Balance at beginning of year | 234,660 | 235,182
Acquisitions and purchase price adjustments (See Note 4) | 73,409 | 579
Impact of segment reorganization |  | (1,101)
Balance at end of period | 308,069 | 234,660
Electrical Services |  |
Changes in the carrying amount of goodwill |  |
Balance at beginning of year | 97,787 |
Acquisitions and purchase price adjustments (See Note 4) | 14,926 | 96,686
Impact of segment reorganization |  | 1,101
Balance at end of period | $ 112,713 | $ 97,787

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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