Fair Value Measurements - Summary of Company's Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Investments, Amortized cost		$ 134,444	$ 86,417
Investments, Gross unrealized gains		93
Investments, Gross unrealized losses		(1,693)	(2,625)
Investments, Fair value	$ 132,844	132,844	83,792
U.S. Treasuries [Member]
Schedule Of Available For Sale Securities [Line Items]
Trading securities, Amortized cost		99,211	74,943
Trading securities, Gross unrealized losses		(500)	(534)
Trading securities, Fair value	98,711	98,711	74,409
Investments, Fair value	98,711		74,409
Mutual Funds Held In Rabbi Trust [Member]
Schedule Of Available For Sale Securities [Line Items]
Trading securities, Amortized cost		10,442	11,474
Trading securities, Gross unrealized gains		79
Trading securities, Gross unrealized losses		(934)	(2,091)
Trading securities, Fair value	9,587	9,587	9,383
Investments, Fair value	9,587		$ 9,383
Corporate Debt [Member]
Schedule Of Available For Sale Securities [Line Items]
Trading securities, Amortized cost		24,791
Trading securities, Gross unrealized gains		14
Trading securities, Gross unrealized losses		(259)
Trading securities, Fair value		$ 24,546
Investments, Fair value	$ 24,546