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Discontinued Operations - Schedule of Condensed Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Discontinued Operations And Disposal Groups [Abstract]
Deferred income taxes	$ 2,461	$ 88,356	$ 8,917
Depreciation and amortization of property, plant and equipment		1,607	4,566
Stock-based compensation		955	634
Expenditures for property, plant and equipment		273	863
Software and software development costs		$ 675	$ 2,466

X

- Definition

Discontinued operations payments to acquire property plant and equipment.

+ References

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X

- Definition

Disposal group including discontinued operation software and software development costs.

+ References

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- Definition

Disposal group including discontinued operation stock based compensation.

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X

- Definition

Disposal group including discontinued operations deferred income tax expense benefit.

+ References

No definition available.

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- Definition

Amount of deprecation and amortization expense attributable to property, plant and equipment and intangible assets of discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

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