The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Goodwill and Other Intangibles - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Finite Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 0.3	$ 0.3	$ 0.6	$ 0.5
2019	1.1		1.1
2020	1.2		1.2
2021	1.2		1.2
2022	1.1		1.1
2023	$ 1.1		$ 1.1
Remaining amortization period			15 years 3 months 18 days
Patents [Member]
Finite Lived Intangible Assets [Line Items]
Remaining amortization period			6 years 6 months
Land Use Rights [Member]
Finite Lived Intangible Assets [Line Items]
Remaining amortization period			56 years 6 months
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Remaining amortization period			8 years 1 month 6 days
Technology [Member]
Finite Lived Intangible Assets [Line Items]
Remaining amortization period			13 years 7 months 6 days
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Remaining amortization period			12 years