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Financial Instruments - Accumulated Unrealized Losses on Marketable Debt Securities in Continuous Loss Position (Detail) - U.S. Treasury securities $ in Thousands	Jun. 30, 2026 USD ($)
Schedule Of Available For Sale Securities [Line Items]
Less than 12 months, Estimated Fair Value	$ 281,701
Less than 12 months, Gross Unrealized Losses	(235)
More than 12 months, Estimated Fair Value	0
More than 12 months, Gross Unrealized Losses	$ 0

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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