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Operating Segment, Geographic and Significant Customer Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Information

Segment information for the years ended December 31, 2017, 2016, and 2015 is as follows:

		Semiconductor Test				System Test				Industrial Automation				Wireless Test				Corporate And Eliminations				Consolidated
		(in thousands)
2017
Revenues		$	1,662,549			$	192,135			$	170,056			$	111,866			$	—			$	2,136,606
Income (loss) before taxes (1)(2)			491,361				10,306				8,763				17,350				(3,368	)			524,412
Total assets (3)			597,480				97,018				368,037				59,912				1,987,098				3,109,545
Property additions			87,920				5,976				7,044				4,435				—				105,375
Depreciation and amortization expense			58,901				6,646				25,711				5,392				11,425				108,075
2016
Revenues		$	1,368,169			$	189,846			$	99,031			$	96,204			$	—			$	1,753,250
Income (loss) before taxes (1)(2)			311,939				28,916				(16,783	)			(371,409	)			(7,723	)			(55,060	)
Total assets (3)			557,546				110,361				317,635				62,366				1,714,585				2,762,493
Property additions			70,543				3,788				6,755				4,186				—				85,272
Depreciation and amortization expense			58,087				6,551				26,869				25,921				2,581				120,009
2015
Revenues		$	1,201,530			$	211,584			$	41,892			$	184,572			$	—			$	1,639,578
Income (loss) before taxes (1)(2)			260,154				25,101				(7,574	)			(13,830	)			(10,727	)			253,124
Total assets (3)			610,869				102,547				344,260				427,880				1,063,118				2,548,674
Property additions			79,052				6,228				1,465				3,133				—				89,878
Depreciation and amortization expense			64,415				4,391				14,500				53,440				4,027				140,773

(1) Included in Corporate and Eliminations are: contingent consideration adjustments, pension and postretirement plans actuarial gains (losses), severance charges, impairment of fixed assets and expenses related to the Japan earthquake, property insurance recovery, interest income, interest expense, net foreign exchange gains (losses), and gain from the sale of an equity investment.

(2) Included in income (loss) before taxes are charges and credits related to restructuring and other, inventory charges, goodwill impairment charges and an acquired intangible assets impairment charge.

(3) Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.

Revenues by Country

Information as to Teradyne’s revenues by country is as follows:

		2017				2016				2015
		(in thousands)
Revenues from customers (1):
Taiwan		$	687,031			$	653,076			$	436,389
China			260,451				174,876				264,898
United States			252,516				221,948				217,386
Korea			206,819				147,882				120,224
Japan			169,093				135,978				128,228
Europe			163,715				117,671				111,903
Malaysia			124,048				103,472				76,707
Philippines			105,850				54,705				96,103
Singapore			101,085				73,172				105,216
Thailand			29,566				43,097				59,104
Rest of the World			36,432				27,373				23,420
		$	2,136,606			$	1,753,250			$	1,639,578

(1) Revenues attributable to a country are based on location of customer site.

Long-Lived Assets by Geographic Area

Long-lived assets by geographic area:

		United States				Foreign(1)				Total
		(in thousands)
December 31, 2017		$	198,855			$	69,592			$	268,447
December 31, 2016		$	189,195			$	64,626			$	253,821

(1) As of December 31, 2017 and 2016, long-lived assets attributable to Singapore were $23.6 million and $31.5 million, respectively.

Wireless Test

Schedule of Segment Reporting Information by Segment Charges

Included in the Wireless Test segment are charges in the following accounts:

		For the Year Ended December 31,
		2017				2016				2015
		(in thousands)
Cost of revenues—inventory charge		$	2,190			$	7,207			$	2,500
Restructuring and other—lease impairment			973				—				—
Restructuring and other—employee severance			—				2,650				—
Goodwill impairment charge			—				254,946				—
Intangible assets impairment charge			—				83,339				—

System Test

Schedule of Segment Reporting Information by Segment Charges

Included in the System Test segment are charges and credits in the following accounts:

		For the Year Ended December 31,
		2017				2016				2015
		(in thousands)
Cost of revenues—inventory charge		$	1,918			$	630			$	8,324
Restructuring and other—employee severance			—				(49	)			1,037

Semiconductor Test

Schedule of Segment Reporting Information by Segment Charges

Included in the Semiconductor Test segment are charges in the following accounts:

		For the Year Ended December 31,
		2017				2016				2015
		(in thousands)
Cost of revenues—inventory charge		$	4,606			$	9,656			$	10,508
Restructuring and other—employee severance			1,779				2,860				499
Restructuring and other—impairment of fixed assets			1,124				—				—

Corporate And Eliminations

Schedule of Segment Reporting Information by Segment Charges

Included in the Corporate and Eliminations segment are charges and credits in the following accounts:

		For the Year Ended December 31,
		2017				2016				2015
		(in thousands)
Restructuring and other—Universal Robots contingent consideration adjustment		$	7,820			$	15,346			$	5,339
Restructuring and other—impairment of fixed assets and expenses related to Japan earthquake			755				5,051				—
Restructuring and other—employee severance			530				—				—
Restructuring and other—property insurance recovery			(5,064	)			(5,051	)			—
Cost of revenues—pension actuarial (gains) losses			(2,752	)			(1,025	)			8,271
Engineering and development—pension actuarial (gains) losses			(2,456	)			(1,234	)			4,658
Selling and administrative—pension actuarial (gains) losses			(1,416	)			(944	)			4,826
Restructuring and other—ZTEC contingent consideration adjustment			—				—				(1,600	)
Restructuring and other—AIT contingent consideration adjustment			—				550				(1,250	)
Restructuring and other—acquisition costs			—				—				1,104
Other (income) expense, net—gain from the sale of an equity investment			—				—				(5,406	)

Industrial Automation

Schedule of Segment Reporting Information by Segment Charges

Included in the Industrial Automation segment are charges in the following accounts:

		For the Year Ended December 31,
		2017				2016				2015
		(in thousands)
Restructuring and other—employee severance		$	1,414			$	585			$	—
Cost of revenues—inventory step-up (1)			—				—				1,567

(1) Included in the cost of revenues for the year ended December 31, 2015 is the cost for purchase accounting inventory step-up.

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