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Debt - Debt (Parenthetical) (Detail) - USD ($)	Jun. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Unamortized debt issuance cost	$ 217,000	$ 275,000
Unsecured private placement 3.95% note [Member]
Debt Instrument [Line Items]
Unamortized debt issuance cost	34,000	56,000
Unsecured private placement 2.30% note [Member]
Debt Instrument [Line Items]
Unamortized debt issuance cost	44,000	55,000
Unsecured private placement 2.37% note [Member]
Debt Instrument [Line Items]
Unamortized debt issuance cost	49,000	60,000
Unsecured private placement 2.73% note [Member]
Debt Instrument [Line Items]
Unamortized debt issuance cost	43,000	52,000
Unsecured private placement 2.83% note [Member]
Debt Instrument [Line Items]
Unamortized debt issuance cost	47,000	52,000
Unsecured private placement 6.17% note [Member]
Debt Instrument [Line Items]
Unamortized debt issuance cost	$ 0	$ 0

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