Fair Value Measurements - Valuation of Company's Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets
Money market funds	$ 12,275	$ 14,206
Assets Fair Value Total	46,572	50,284
Liabilities
Contingent consideration payable	12,121	41,090
Mutual Funds Held In Rabbi Trust [Member]
Assets
Trading securities	9,859	11,195
U.S. Treasuries [Member]
Assets
Trading securities	24,438	24,883
Level 1 [Member]
Assets
Money market funds	12,275	14,206
Assets Fair Value Total	12,275	14,206
Level 2 [Member]
Assets
Assets Fair Value Total	34,297	36,078
Level 2 [Member] | Mutual Funds Held In Rabbi Trust [Member]
Assets
Trading securities	9,859	11,195
Level 2 [Member] | U.S. Treasuries [Member]
Assets
Trading securities	24,438	24,883
Level 3 [Member]
Liabilities
Contingent consideration payable	$ 12,121	$ 41,090