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Schedule of Amortizable Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands		12 Months Ended
	Apr. 25, 2018	Dec. 31, 2018	Dec. 31, 2016
Finite-Lived Intangible Assets
Impairment of intangible assets		$ 8,800	$ 83,339
Intangible Assets [Member]
Finite-Lived Intangible Assets
Impairment of intangible assets		8,800
Mobile Industrial Robots (MiR)
Finite-Lived Intangible Assets
Intangible assets acquired	$ 80,670	80,700
Energid Technologies Corporation
Finite-Lived Intangible Assets
Intangible assets acquired		$ 12,300

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

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