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Fair Value Measurement - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Fair Value Measurement [Line Items]
Carrying value of debt	$ 346,607	$ 342,465
Restricted investments	19,800	18,100
Fixed-rate Borrowings [Member]
Fair Value Measurement [Line Items]
Increase (decrease) in fair value of debt	8,900	11,700
Carrying value of debt	$ 346,600	$ 342,500

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- Definition

Fair value measurement.

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Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

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- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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The aggregate value of all restricted investments.

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