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Goodwill and Identifiable Intangible Assets, Net - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Changes in the carrying amount of goodwill |  |  |  |
Balance at beginning of year |  | $ 235,182 | $ 200,584 |
Acquisitions and purchase price adjustments (See Note 4) |  | 97,265 | 34,598 |
Impairment adjustment | $ (1,100) |  |  | $ (1,105)
Balance at end of period |  | 332,447 | 235,182 | 200,584
Mechanical Services Segment |  |  |  |
Changes in the carrying amount of goodwill |  |  |  |
Accumulated impairment charges |  | 116,600 | 116,600 |
Mechanical Services |  |  |  |
Changes in the carrying amount of goodwill |  |  |  |
Balance at beginning of year |  | 235,182 | 200,584 |
Acquisitions and purchase price adjustments (See Note 4) |  | 579 | 34,598 |
Impact of segment reorganization |  | (1,101) |  |
Balance at end of period |  | 234,660 | $ 235,182 | $ 200,584
Electrical Services |  |  |  |
Changes in the carrying amount of goodwill |  |  |  |
Acquisitions and purchase price adjustments (See Note 4) |  | 96,686 |  |
Impact of segment reorganization |  | 1,101 |  |
Balance at end of period |  | $ 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=108376223&loc=d3e13816-109267 + Details
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