Summary of Assets and Liabilities Recorded at Fair Value on Recurring Basis (Detail) - Recurring - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Assets:
Assets, fair value	$ 178,706	$ 213,370
Liabilities:
Liabilities, fair value	35,510	32,998
Money Market Mutual Funds
Assets:
Assets, fair value	60,175	106,530
Certificates of Deposit
Assets:
Assets, fair value	2,200	5,415
Available for Sale Securities
Assets:
Assets, fair value	70,478	55,594
Deferred Compensation Assets
Assets:
Assets, fair value	35,510	32,998
Interest Rate Swap Agreements
Assets:
Assets, fair value		3,925
Foreign Currency Foreign Exchange Contracts
Assets:
Assets, fair value	10,343	8,908
Deferred Compensation Liability
Liabilities:
Liabilities, fair value	35,510	32,998
Basis of Fair Value Measurement, Level 1
Assets:
Assets, fair value	168,363	200,537
Liabilities:
Liabilities, fair value	35,510	32,998
Basis of Fair Value Measurement, Level 1 | Money Market Mutual Funds
Assets:
Assets, fair value	60,175	106,530
Basis of Fair Value Measurement, Level 1 | Certificates of Deposit
Assets:
Assets, fair value	2,200	5,415
Basis of Fair Value Measurement, Level 1 | Available for Sale Securities
Assets:
Assets, fair value	70,478	55,594
Basis of Fair Value Measurement, Level 1 | Deferred Compensation Assets
Assets:
Assets, fair value	35,510	32,998
Basis of Fair Value Measurement, Level 1 | Deferred Compensation Liability
Liabilities:
Liabilities, fair value	35,510	32,998
Basis of Fair Value Measurement, Level 2
Assets:
Assets, fair value	10,343	12,833
Basis of Fair Value Measurement, Level 2 | Interest Rate Swap Agreements
Assets:
Assets, fair value		3,925
Basis of Fair Value Measurement, Level 2 | Foreign Currency Foreign Exchange Contracts
Assets:
Assets, fair value	$ 10,343	$ 8,908