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Notes Payable - Components of Notes Payable (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Notes payable | $ 413,775 | $ 426,500
Unamortized debt issuance cost | (33) | (49)
Notes payable, net | 413,742 | 426,451
Unsecured Revolving Lines of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | 313,775 | 266,500
Series C senior notes [Member] | 3.84% Series C senior notes due in 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable |  | 60,000
Series C senior notes [Member] | 2.35% Series E senior notes due in 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | 60,000 |
Series E senior notes [Member] | 2.35% Series E senior notes due in 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | 60,000 | 60,000
Series D senior notes [Member] | 2.57% Series D senior notes due in 2028 [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable | $ 40,000 | $ 40,000

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