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Changes in Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Jun. 11, 2015	Oct. 31, 2014	Oct. 25, 2013
Goodwill [Line Items]
Goodwill	$ 781,058	$ 770,515	$ 996,033
Accumulated impairment losses	(507,620)	(408,723)	(507,620)
Goodwill	273,438		488,413
Foreign currency translation adjustment	(6,153)
ZTEC Instruments, Inc.
Goodwill [Line Items]
Goodwill						$ 12,520
Adjustment		27
Avionics Interface Technologies, LLC
Goodwill [Line Items]
Goodwill					$ 10,516
Acquisition		10,516
Universal Robots
Goodwill [Line Items]
Goodwill				$ 221,128
Acquisition	221,128
Semiconductor Test
Goodwill [Line Items]
Goodwill	361,819	361,792	361,819
Accumulated impairment losses	(98,897)		(98,897)
Goodwill			262,922
Semiconductor Test | ZTEC Instruments, Inc.
Goodwill [Line Items]
Adjustment		27
Industrial Automation
Goodwill [Line Items]
Goodwill			214,975
Goodwill			214,975
Foreign currency translation adjustment	(6,153)
Industrial Automation | Universal Robots
Goodwill [Line Items]
Acquisition	221,128
System Test
Goodwill [Line Items]
Goodwill	158,699	148,183	158,699
Accumulated impairment losses	(148,183)	(148,183)	(148,183)
Goodwill			10,516
System Test | Avionics Interface Technologies, LLC
Goodwill [Line Items]
Acquisition		10,516
Wireless Test
Goodwill [Line Items]
Goodwill	260,540	260,540	260,540
Accumulated impairment losses	$ (260,540)	$ (260,540)	$ (260,540)

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
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+ References

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+ References

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+ References

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