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Investments - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities by Contractual Maturities (Detail) - Failed Auction Security [Member] $ in Thousands | Jun. 30, 2026 USD ($)
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Debt Securities, Available-for-Sale [Line Items] |
Due in sixteen years, Cost | $ 3,000
Due in sixteen years, Estimated Fair Value | $ 2,525

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