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Acquisitions (Estimated Useful Life and Fair Value) (Detail) - Engineered Molding Technology LLC [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Fair Value	$ 14,360
Customer Relationships [Member]
Weighted Average Useful Life (in years)	14 years
Fair Value	$ 11,080
Developed Technology Rights [Member]
Weighted Average Useful Life (in years)	11 years
Fair Value	$ 2,910
Trademark and tradename [Member]
Weighted Average Useful Life (in years)	14 years
Fair Value	$ 320
Noncompete Agreements [Member]
Weighted Average Useful Life (in years)	3 years
Fair Value	$ 50

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