Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets
Gross carrying Amount	$ 783,427	$ 743,280
Accumulated amortization	445,795	409,328
Net carrying value	$ 337,632	$ 333,952
Weighted average life in years	10 years 1 month 6 days	9 years 8 months 12 days
Developed Technology
Finite-Lived Intangible Assets
Gross carrying Amount	$ 283,272	$ 272,334
Accumulated amortization	221,651	204,689
Net carrying value	$ 61,621	$ 67,645
Weighted average life in years	7 years 1 month 6 days	7 years 1 month 6 days
Trademarks and Trade names
Finite-Lived Intangible Assets
Gross carrying Amount	$ 30,100	$ 29,106
Accumulated amortization	18,374	16,326
Net carrying value	$ 11,726	$ 12,780
Weighted average life in years	10 years 1 month 6 days	10 years 1 month 6 days
Customer Relationships
Finite-Lived Intangible Assets
Gross carrying Amount	$ 449,659	$ 405,537
Accumulated amortization	193,313	161,551
Net carrying value	$ 256,346	$ 243,986
Weighted average life in years	12 years 2 months 12 days	11 years 9 months 18 days
Other
Finite-Lived Intangible Assets
Gross carrying Amount	$ 20,396	$ 36,303
Accumulated amortization	12,457	26,762
Net carrying value	$ 7,939	$ 9,541
Weighted average life in years	6 years 7 months 6 days	4 years 1 month 6 days