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Employee Benefit Plans - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unrecognized actuarial gains (losses), before tax |  | $ 10,725,000,000 |  |
Amount of United common stock held in the pension plan |  | $ 197,381,000 | $ 183,035,000 | $ 173,840,000
Percentage of projected benefit obligation |  | 10.00% |  |
Minimum number of days required to be eligible for the participation in the plan |  | 90 days |  |
Percentage of salary deferred under condition one of contribution by company | 100.00% |  |  |
First percentage of salary deferred under condition one of contribution by company | 5.00% |  |  |
Vesting percentage of employee deferrals | 100.00% |  |  |
Cost related to savings and stock investment plan |  | $ 7,829,000 | $ 7,332,000 | 7,590,000
Employer contribution in shares of common stock |  | 1,879,671 | 1,810,400 |
Dividends paid on United common stock |  | $ 2,755,000 | $ 2,727,000 | $ 2,468,000
Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Maximum percentage allowed as of contribution to respective accounts by participants | 1.00% |  |  |
Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Maximum percentage allowed as of contribution to respective accounts by participants | 100.00% |  |  |
Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Amount of United common stock held in the pension plan |  | $ 4,064,000 | 3,974,000 |
Maximum percentage limit of common stock to invest in portfolio for any industry |  | 47.00% |  |
Approximate fair value of plan assets |  | $ 72,179,000 | $ 67,981,000 |
Equity Securities [Member] | Minimum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Maximum percentage limit of common stock to invest in portfolio for any industry |  | 20.00% |  |
Equity Securities [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Maximum percentage limit of common stock to invest in portfolio for any industry |  | 70.00% |  |
Individual Company [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Maximum percentage limit of common stock to invest in portfolio for any industry |  | 10.00% |  |
Industry [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Maximum percentage limit of common stock to invest in portfolio for any industry |  | 15.00% |  |
Securities of U.S. Government or Agencies [Member] | Maximum [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Maximum percentage limit of common stock to invest in portfolio for any industry |  | 15.00% |  |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of employer security in which defined benefit plan asset is invested. Includes, but is not limited to, security issued or managed by related party of employer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (n) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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