Fair Value of Financial Assets and Liabilities - Narrative (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, fair value	$ 5,999	$ 24,279
Undiscounted value of the payments on all contingencies	10,700	34,700
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative to equity securities	$ 82,500	$ 83,800