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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
Mar. 31, 2026
USD ($)
Debt Securities, Available-for-Sale [Line Items]  
Due in sixteen years, Cost $ 3,000
Due in sixteen years, Estimated Fair Value $ 2,508