Fair Value Measurement - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2024	Dec. 31, 2023
Fair Value Measurement [Line Items]
Carrying value of debt	$ 313,067	$ 350,682
Restricted investments	21,000	20,800
Fixed-rate Borrowings [Member]
Fair Value Measurement [Line Items]
Increase (decrease) in fair value of debt	2,100	1,400
Carrying value of debt	$ 313,100	$ 350,700

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

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Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant