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Stockholders' Equity - Valuation Assumptions of Granted Stock Options (Parenthetical) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total fair value of options granted			$ 1,853,000
Stock-based compensation expense - Cost of sales	$ 317,000	$ 321,000	303,000
Stock-based compensation expense - SG&A	108,000	836,000	1,410,000
Income tax benefit	$ (164,000)	$ (444,000)	(662,000)
Discontinued Operations [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total fair value of options granted			62,000
Stock-based compensation expense - Cost of sales			126,000
Stock-based compensation expense - SG&A			508,000
Income tax benefit			$ (244,000)

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements with employees, directors and certain consultants qualifying for treatment as employees included in cost of sales.

+ References

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements with employees, directors and certain consultants qualifying for treatment as employees included in SG&A.

+ References

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- Definition

The total grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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