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Acquisitions - Estimated Fair Values of Identifiable Intangible Assets and Related Weighted Average Amortization (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2023
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Fair Value |  | $ 115,500
Acquisitions 2023 |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Fair Value | $ 115,515 |
Weighted Average Amortization Period in Years | 5 years 6 months |
Acquisitions 2023 | Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Fair Value | $ 83,180 |
Weighted Average Amortization Period in Years | 4 years 7 months 6 days |
Acquisitions 2023 | Backlog |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Fair Value | $ 11,564 |
Weighted Average Amortization Period in Years | 9 months 18 days |
Acquisitions 2023 | Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Fair Value | $ 13,797 |
Weighted Average Amortization Period in Years | 15 years |
Acquisitions 2023 | Non-compete agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated Fair Value | $ 6,974 |
Weighted Average Amortization Period in Years | 5 years |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 926 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483154/926-20-50-5 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-1 + Details
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