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Schedule of Segment Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |
Revenues | [1],[2] | $ 3,702,881 | $ 3,121,469 | $ 2,294,965
Income (loss) before taxes | [3],[4] | 1,160,955 | 901,015 | 525,772
Total assets | [5] | 3,809,425 | 3,652,346 | 2,787,014
Property additions |  | 132,472 | 184,977 | 134,642
Depreciation and amortization expense |  | 125,485 | 126,743 | 120,655
Semiconductor Test |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues |  | 2,642,342 | 2,259,597 | 1,552,571
Income (loss) before taxes | [3],[4] | 976,988 | 739,695 | 416,973
Total assets | [5] | 1,245,596 | 1,070,378 | 784,808
Property additions |  | 115,618 | 168,055 | 112,145
Depreciation and amortization expense |  | 75,982 | 64,998 | 59,197
System Test |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | [1] | 467,739 | 409,729 | 287,455
Income (loss) before taxes | [3],[4] | 163,064 | 152,092 | 93,543
Total assets | [5] | 170,954 | 138,295 | 131,428
Property additions |  | 3,905 | 3,092 | 3,059
Depreciation and amortization expense |  | 3,156 | 3,426 | 5,518
Industrial Automation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues |  | 375,905 | 279,731 | 298,139
Income (loss) before taxes | [3],[4] | (8,167) | (24,019) | (5,916)
Total assets | [5] | 701,196 | 712,936 | 671,559
Property additions |  | 9,821 | 8,899 | 9,076
Depreciation and amortization expense |  | 27,336 | 36,242 | 40,904
Wireless Test |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | [1] | 216,895 | 173,016 | 157,315
Income (loss) before taxes | [3],[4] | 83,543 | 41,950 | 35,585
Total assets | [5] | 107,513 | 106,273 | 97,299
Property additions |  | 3,128 | 4,931 | 10,362
Depreciation and amortization expense |  | 6,055 | 6,258 | 5,365
Corporate And Others [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues |  |  | (604) | (515)
Income (loss) before taxes | [3],[4] | (54,473) | (8,703) | (14,413)
Total assets | [5] | 1,584,166 | 1,624,464 | 1,101,920
Depreciation and amortization expense |  | $ 12,956 | $ 15,819 | $ 9,671
[1] | Includes $13.2 million, $10.0 million and $8.4 million in 2021, 2020 and 2019, respectively, for leases of Teradyne’s systems recognized outside of ASC 606: “Revenue from Contracts with Customers.”
[2] | Revenues attributable to a country are based on location of customer site.
[3] | Included in Corporate and Other are: loss on convertible debt conversions, contingent consideration adjustments, investment impairment, interest income, interest expense, pension and postretirement plan actuarial gains (losses), severance charges, net foreign exchange gains (losses), intercompany eliminations and acquisition related: (a) charges; (b) legal fees; (c) compensation.
[4] | Included in income (loss) before taxes are charges and credits related to restructuring and other, loss on convertible debt conversions and inventory charges.
[5] | Total assets are attributable to each segment. Corporate assets consist of cash and cash equivalents, marketable securities and certain other assets.

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