Summary of Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) - Recurring - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Assets:
Assets, fair value	$ 240,105	$ 214,732
Liabilities:
Liabilities, fair value	53,883	49,222
Money Market Mutual Funds | Other Noncurrent Assets
Assets:
Assets, fair value	120,968	115,399
Certificates of Deposit | Other Noncurrent Assets
Assets:
Assets, fair value	2,206	2,206
Equity Securities | Other Noncurrent Assets
Assets:
Assets, fair value	62,069	47,333
Deferred Compensation Assets | Other Noncurrent Assets
Assets:
Assets, fair value	53,883	49,222
Foreign Currency Forward Exchange Contracts | Other Current Assets
Assets:
Assets, fair value	979	572
Deferred Compensation Liability | Other Noncurrent Liabilities
Liabilities:
Liabilities, fair value	53,883	49,222
Basis of Fair Value Measurement, Level 1
Assets:
Assets, fair value	236,920	211,954
Liabilities:
Liabilities, fair value	53,883	49,222
Basis of Fair Value Measurement, Level 1 | Money Market Mutual Funds | Other Noncurrent Assets
Assets:
Assets, fair value	120,968	115,399
Basis of Fair Value Measurement, Level 1 | Equity Securities | Other Noncurrent Assets
Assets:
Assets, fair value	62,069	47,333
Basis of Fair Value Measurement, Level 1 | Deferred Compensation Assets | Other Noncurrent Assets
Assets:
Assets, fair value	53,883	49,222
Basis of Fair Value Measurement, Level 1 | Deferred Compensation Liability | Other Noncurrent Liabilities
Liabilities:
Liabilities, fair value	53,883	49,222
Basis of Fair Value Measurement, Level 2
Assets:
Assets, fair value	3,185	2,778
Basis of Fair Value Measurement, Level 2 | Certificates of Deposit | Other Noncurrent Assets
Assets:
Assets, fair value	2,206	2,206
Basis of Fair Value Measurement, Level 2 | Foreign Currency Forward Exchange Contracts | Other Current Assets
Assets:
Assets, fair value	$ 979	$ 572