Summary of Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) - Recurring - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets:
Assets, fair value	$ 159,880	$ 178,706
Liabilities:
Liabilities, fair value	36,911	35,510
Money Market Mutual Funds
Assets:
Assets, fair value	60,693	60,175
Certificates of Deposit
Assets:
Assets, fair value	2,200	2,200
Available for Sale Securities
Assets:
Assets, fair value	60,878	70,478
Deferred Compensation Assets
Assets:
Assets, fair value	36,109	35,510
Foreign Currency Foreign Exchange Contracts
Assets:
Assets, fair value		10,343
Liabilities:
Liabilities, fair value	802
Deferred Compensation Liability
Liabilities:
Liabilities, fair value	36,109	35,510
Basis of Fair Value Measurement, Level 1
Assets:
Assets, fair value	159,880	168,363
Liabilities:
Liabilities, fair value	36,109	35,510
Basis of Fair Value Measurement, Level 1 | Money Market Mutual Funds
Assets:
Assets, fair value	60,693	60,175
Basis of Fair Value Measurement, Level 1 | Certificates of Deposit
Assets:
Assets, fair value	2,200	2,200
Basis of Fair Value Measurement, Level 1 | Available for Sale Securities
Assets:
Assets, fair value	60,878	70,478
Basis of Fair Value Measurement, Level 1 | Deferred Compensation Assets
Assets:
Assets, fair value	36,109	35,510
Basis of Fair Value Measurement, Level 1 | Deferred Compensation Liability
Liabilities:
Liabilities, fair value	36,109	35,510
Basis of Fair Value Measurement, Level 2
Assets:
Assets, fair value		10,343
Liabilities:
Liabilities, fair value	802
Basis of Fair Value Measurement, Level 2 | Foreign Currency Foreign Exchange Contracts
Assets:
Assets, fair value		$ 10,343
Liabilities:
Liabilities, fair value	$ 802