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Notes Payable - Components of Notes Payable (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Debt Instrument [Line Items]
Notes payable	$ 293,459				$ 298,603
Unamortized debt issuance cost	(28)				(39)
Notes payable, net	293,431	$ 301,469	$ 301,878	$ 289,464	298,564	$ 309,006	$ 314,860	$ 300,595
Unsecured Revolving Lines of Credit [Member]
Debt Instrument [Line Items]
Notes payable	193,459				198,603
Series B senior notes [Member] | 3.68% Series B senior notes due in 2021 [Member]
Debt Instrument [Line Items]
Notes payable	40,000				40,000
Series C senior notes [Member] | 3.84% Series C senior notes due in 2022 [Member]
Debt Instrument [Line Items]
Notes payable	$ 60,000				$ 60,000

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- Definition

Notes payable amount after reclassification of prepaid debt financing cost.

+ References

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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