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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Goodwill and Other Intangibles - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Finite Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 0.3	$ 0.3	$ 0.8	$ 0.8
2017	0.3		0.3
2018	1.0		1.0
2019	1.0		1.0
2020	0.9		0.9
2021	$ 0.9		$ 0.9
Remaining amortization period			16 years 8 months 13 days
Patents [Member]
Finite Lived Intangible Assets [Line Items]
Remaining amortization period			8 years 3 months 19 days
Land Use Rights [Member]
Finite Lived Intangible Assets [Line Items]
Remaining amortization period			58 years 3 months 19 days
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Remaining amortization period			9 years 3 months 19 days
Technology [Member]
Finite Lived Intangible Assets [Line Items]
Remaining amortization period			14 years 2 months 13 days
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Remaining amortization period			12 years 6 months