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Debt - Debt (Parenthetical) (Detail) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Unamortized debt issuance cost	$ 1,017,000	$ 686,000
Senior unsecured 3.95% note [Member]
Debt Instrument [Line Items]
Unamortized debt issuance cost	215,000	186,000
Senior unsecured 3.86% note [Member]
Debt Instrument [Line Items]
Unamortized debt issuance cost	125,000	125,000
Senior unsecured 4.86% note [Member]
Debt Instrument [Line Items]
Unamortized debt issuance cost	0	30,000
Senior unsecured 2.30% note [Member]
Debt Instrument [Line Items]
Unamortized debt issuance cost	159,000	122,000
Senior unsecured 2.37% note [Member]
Debt Instrument [Line Items]
Unamortized debt issuance cost	165,000	128,000
Senior unsecured 2.73% note [Member]
Debt Instrument [Line Items]
Unamortized debt issuance cost	201,000	55,000
Senior unsecured 2.83% note [Member]
Debt Instrument [Line Items]
Unamortized debt issuance cost	$ 152,000	$ 40,000

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