Fair Value Measurements - Valuation of Company's Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Assets
Money market funds	$ 23,355	$ 55,473
Assets Fair Value Total	195,879	220,733
Liabilities
Total liabilities		936
Mutual Funds Held In Rabbi Trust [Member]
Assets
Mutual funds held in rabbi trust	11,465	11,107
U.S. Treasuries [Member]
Assets
Trading securities, Fair value	100,772	99,045
Foreign Currency Forward Position [Member]
Assets
Foreign currency forward position	1,847
Liabilities
Foreign currency forward position		936
Corporate Debt [Member]
Assets
Securities available-for-sale	58,440	55,108
Level 1 [Member]
Assets
Money market funds	23,355	55,473
Assets Fair Value Total	23,355	55,473
Level 2 [Member]
Assets
Assets Fair Value Total	172,524	165,260
Liabilities
Total liabilities		936
Level 2 [Member] | Mutual Funds Held In Rabbi Trust [Member]
Assets
Mutual funds held in rabbi trust	11,465	11,107
Level 2 [Member] | U.S. Treasuries [Member]
Assets
Trading securities, Fair value	100,772	99,045
Level 2 [Member] | Foreign Currency Forward Position [Member]
Assets
Foreign currency forward position	1,847
Liabilities
Foreign currency forward position		936
Level 2 [Member] | Corporate Debt [Member]
Assets
Securities available-for-sale	$ 58,440	$ 55,108