Summary of Significant Accounting Policies - Supplemental Executive Savings Plan (Detail) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended	9 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Sep. 30, 2024	Sep. 30, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
SESP contribution amount	$ 22	$ 27
Gain on marketable securities and long-term restricted investments			$ 192	$ 526
Interest and dividend income			5	17
Long-term restricted investments (SESP)			3,755	3,755	$ 3,194
Long-term deferred compensation (SESP)			$ 3,755	$ 3,755	$ 3,216