Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) |
3 Months Ended | 9 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2023 |
Dec. 31, 2019 |
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| Goodwill And Intangible Assets Disclosure [Line Items] | ||||||
| Goodwill impairment | $ 0 | $ 0 | ||||
| Impairment of intangible assets | 0 | 0 | $ 77,400,000 | $ 25,800,000 | ||
| Intangible Asset, Finite-Lived, Amortization Expense | 18,511,000 | $ 18,512,000 | 55,535,000 | $ 55,536,000 | ||
| Subsidiaries | ||||||
| Goodwill And Intangible Assets Disclosure [Line Items] | ||||||
| Intangible Asset, Finite-Lived, Amortization Expense | $ 22,900,000 | $ 22,900,000 | $ 68,600,000 | $ 68,600,000 | ||
| X | ||||||||||
- Definition Goodwill and intangible assets disclosure [Line items]. No definition available.
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| X | ||||||||||
- Definition Amount of amortization expense for finite-lived intangible asset. Excludes goodwill and capitalized cost for software to be sold, leased, or marketed. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of impairment loss for finite- and indefinite-lived intangible assets and capitalized cost for software to be sold, leased, or marketed. Excludes goodwill. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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