Business Acquisitions (Detail) - USD ($) $ in Thousands				12 Months Ended		24 Months Ended
	May 01, 2019	Mar. 04, 2019	Jan. 28, 2019	Dec. 31, 2020	Dec. 31, 2019	Apr. 30, 2021
Business Acquisition [Line Items]
Identifiable intangible assets				$ 6,100	$ 159,700
Goodwill, Acquired During Period				22,857	$ 469,446
Aeryon Lab [Member]
Business Acquisition [Line Items]
Cash acquired				5,145
Net tangible assets				6,097
Net deferred taxes				11,130
Identifiable intangible assets			$ 44,292
Goodwill, Acquired During Period			161,518
Total purchase price			$ 205,900	205,922
Endeavor [Member]
Business Acquisition [Line Items]
Cash acquired				6,687
Net tangible assets				14,915
Net deferred taxes				9,776
Identifiable intangible assets		$ 102,740
Goodwill, Acquired During Period		271,365
Total purchase price		385,900		385,931
Endeavor [Member] | Developed Technology
Business Acquisition [Line Items]
Identifiable intangible assets		$ 60,400
Weighted average estimated useful life		5 years
NEOS [Member]
Business Acquisition [Line Items]
Cash acquired				15
Net tangible assets				1,479
Identifiable intangible assets	$ 6,400
Goodwill, Acquired During Period	13,987
Total purchase price	$ 21,900			21,881
NEOS [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Total purchase price						$ 12,000
Altavian [Member]
Business Acquisition [Line Items]
Cash acquired				157
Net tangible assets				1,491
Net deferred taxes				3,526
Identifiable intangible assets				6,075
Goodwill, Acquired During Period				22,857
Total purchase price				34,106
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable				7,300
Altavian [Member] | Developed Technology
Business Acquisition [Line Items]
Identifiable intangible assets				$ 5,100
Weighted average estimated useful life				10 years
Altavian [Member] | Computer Software, Intangible Asset
Business Acquisition [Line Items]
Identifiable intangible assets				$ 800
Weighted average estimated useful life				5 years
Altavian [Member] | Noncompete Agreements
Business Acquisition [Line Items]
Identifiable intangible assets				$ 175
Weighted average estimated useful life				5 years