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Fair Value Measurement - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Fair Value Measurement [Line Items]
Carrying value of debt	$ 286,832	$ 274,752
Restricted investments	19,100	24,300
Fixed-rate Borrowings [Member]
Fair Value Measurement [Line Items]
Increase (decrease) in fair value of debt	7,100
Carrying value of debt	$ 286,800	$ 274,800

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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