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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | The following table presents the input level used to determine the fair value of the financial instruments measured at fair value on a recurring basis (in thousands):
| December 31, 2025
| Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |
Cash equivalents - money market | $ | 572 |  |  | $ | — |  |  | $ | — |
Interest rate swap instruments | $ | — |  |  | $ | 42 |  |  | $ | — |
Liabilities: |  |  |  |  |
Interest rate swap instruments | $ | — |  |  | $ | 1,194 |  |  | $ | — |
| December 31, 2024
| Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |
Cash equivalents - money market | $ | 49,217 |  |  | $ | — |  |  | $ | — |
Interest rate swap instruments | $ | — |  |  | $ | 9,248 |  |  | $ | — |
Liabilities: |  |  |  |  |
Interest rate swap instruments | $ | — |  |  | $ | 137 |  |  | $ | — |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation | The following is a Level 3 summary of changes in contingent consideration liabilities (in thousands):
| 2024
Balance, beginning of period | $ | 65,700 |
Payment of contingent consideration - cash | (65,700) |
Balance, end of period | $ | — |
Schedule of Carrying Values and Fair Values of Debt Instruments | The table below shows the fair value and carrying value of the term loan and promissory notes (a component of notes payable) included in Total debt as shown in "Note 9—Debt" (in thousands):
| December 31, 2025 |  | December 31, 2024
| Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value
Term loan | $ | 803,995 |  |  | $ | 792,515 |  |  | $ | 1,597,825 |  |  | $ | 1,576,502 |
Promissory notes | $ | 21,490 |  |  | $ | 22,906 |  |  | $ | 19,475 |  |  | $ | 22,646 |
Schedule of Additional Cash Flow Information | During the tax year 2025, cash paid for income taxes, net of refunds consisted of the following:
| Year Ended December 31, 2025
Federal | $ | 9,605 |
California | 1,228 |
Pennsylvania | 942 |
Other States | 4,667 |
Foreign | — |
Total | $ | 16,442 |
Additional cash flow information was as follows (in thousands):
| Year Ended December 31,
| 2025 |  | 2024 |  | 2023
Cash paid for interest and taxes |  |  |  |  |
Interest paid, net of interest rate swaps(a) | $ | 96,884 |  |  | $ | 85,662 |  |  | $ | 61,794 |
Income taxes paid, net of refunds | $ | 16,442 |  |  | $ | 17,496 |  |  | $ | 10,160 |
Non-cash investing activities |  |  |  |  |
Property and equipment additions included in Accounts payable | $ | 4,906 |  |  | $ | 429 |  |  | $ | 579 |
Non-cash financing activities |  |  |  |  |
Parent issuance of Parent interests for contingent consideration - related parties | $ | — |  |  | $ | — |  |  | $ | 9,325 |
Deferred offering costs included in Accounts payable | $ | 60 |  |  | $ | 3,488 |  |  | $ | — |
Contribution from Legence Parent for Series A Interests and Restricted Series C Interests | $ | 30,510 |  |  | $ | — |  |  | $ | — |
Contribution from Legence Parent II for Series A Interests | $ | 17,805 |  |  | $ | — |  |  | $ | — |
TRA liability - secondary offering exchanges | $ | 58,060 |  |  | $ | — |  |  | $ | — |
Deferred tax asset, net of valuation allowance, recognized in connection with TRA liability - secondary offering exchanges | $ | 4,552 |  |  | $ | — |  |  | $ | — |
Non-cash financing activities related to IPO and Corporate Reorganization |  |  |  |  |
Reclassification of Series A Interests and Restricted Series C Interests from liability to equity | $ | 36,358 |  |  | $ | — |  |  | $ | — |
TRA liability recognized | $ | 146,474 |  |  | $ | — |  |  | $ | — |
Deferred tax asset, net of valuation allowance, recognized in connection with TRA liability | $ | 28,697 |  |  | $ | — |  |  | $ | — |
(a)The Company classifies the cash flows resulting from its interest rate swaps in Cash provided by operating activities on the Consolidated Statements of Cash Flows consistent with the interest that is hedged. Refer to “Note 11—Derivatives” for additional information on the Company's interest rate swaps.

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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