Fair Value Measurements - Fair Value of Assets and Liabilities Measured on Recurring Basis, Including Derivative Instruments (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands		Jun. 30, 2020		Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instruments, assets	[1],[2]	$ 9,309		$ 21,309
Deferred compensation plan assets		21,837	[1],[3]	11,208
Total, assets		31,146		32,517
Earn out consideration	[4],[5]	21,935		22,184
Derivative instruments, liabilities	[2],[4]	69,228		24,239
Deferred compensation plan liability		21,375	[4],[6]	10,943
Total, liabilities		112,538		57,366
Fair Value, Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative instruments, assets	[1],[2]	9,309		21,309
Total, assets		9,309		21,309
Derivative instruments, liabilities	[2],[4]	69,228		24,239
Total, liabilities		69,228		24,239
Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Deferred compensation plan assets		21,837	[1],[3]	11,208
Total, assets		21,837		11,208
Earn out consideration	[4],[5]	21,935		22,184
Deferred compensation plan liability		21,375	[4],[6]	10,943
Total, liabilities		$ 43,310		$ 33,127

[1] Included in “prepaid expenses and other current assets” and “other assets” in the consolidated balance sheets

[2] The Company values its derivative instruments based on market observable inputs, including both forward and spot prices for the relevant currencies and interest rate indices for relevant interest rates. The quotes are taken from an independent market database

[3] Deferred compensation plan assets consist of life insurance policies held under a Rabbi Trust. Assets held in the Rabbi Trust are valued based on the cash surrender value of the insurance contract, which is determined based on the fair value of the underlying assets included in the insurance portfolio and are therefore classified within level 3 of the fair value hierarchy

[4] Included in “accrued expenses and other current liabilities” and “other liabilities” in the consolidated balance sheets

[5] The fair value of earn-out consideration, calculated as the present value of expected future payments to be made to the sellers of acquired businesses, was derived by estimating the future financial performance of the acquired businesses using the earn-out formula and performance targets specified in each purchase agreement and adjusting the result to reflect the Company’s estimate of the likelihood of achievement of such targets. Given the significance of the unobservable inputs, the valuations are classified in level 3 of the fair value hierarchy

[6] The fair value of the deferred compensation plan liability is derived based on the fair value of the underlying assets in the insurance policies and is therefore classified within level 3 of the fair value hierarchy