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Investments - Cash Equivalents and Investments held at Fair Value (Detail) - Fair Value, Measurements [Member] - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities [Line Items]
Total	$ 34,627	$ 33,045
Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
Schedule of Available-for-sale Securities [Line Items]
Total	34,627	33,045
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents	5,375	5,302
Money Market Funds [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents	5,375	5,302
Marketable Equity Securities - Various Industries [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable equity securities	987	905
Marketable Equity Securities - Various Industries [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable equity securities	987	905
Deferred Compensation Plan Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable equity securities	28,265	26,838
Deferred Compensation Plan Assets [Member] | Quoted Prices in Active Market for Identical Assets (Level 1) [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable equity securities	$ 28,265	$ 26,838

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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