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Goodwill - Changes in Carrying Amounts of Goodwill by Segment (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 4,224,906
Goodwill acquired from 2021 acquisitions	982,600
Purchase price allocation adjustments and other	1,900
Foreign currency translation adjustments	(28,400)
Goodwill, ending balance	5,180,999
Electronic Instruments Group
Goodwill [Roll Forward]
Goodwill, beginning balance	3,050,300
Goodwill acquired from 2021 acquisitions	976,700
Purchase price allocation adjustments and other	1,900
Foreign currency translation adjustments	(15,900)
Goodwill, ending balance	4,013,000
Electromechanical Group
Goodwill [Roll Forward]
Goodwill, beginning balance	1,174,600
Goodwill acquired from 2021 acquisitions	5,900
Purchase price allocation adjustments and other	0
Foreign currency translation adjustments	(12,500)
Goodwill, ending balance	$ 1,168,000

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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