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Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 03, 2021
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Standard warranty period | 12 months |  |  |
Depreciation over life to cost of revenues and selling and administrative expenses, years | 6 years |  |  |
Net book value of internally manufactured test systems sold | $ 16,600 | $ 7,300 | $ 5,000 |
Advertising costs | 13,400 | 12,800 | 16,600 |
Losses (gains) on foreign currency transactions | 2,100 | 2,600 | $ 1,600 |
Trade Accounts Receivable | 111,300 | 131,100 |  |
Debt Instrument, Face Amount | $ 116,980 | 459,971 |  |
OnePointTwoFivePercentConvertibleSeniorUnsecuredNotesDueDecemberFifteenTwoThousandTwentyThree [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Debt Instrument, Convertible, Carrying Amount of Equity Component |  |  |  | $ 100,800
Debt Instrument, Face Amount |  | $ 460,000 |  |

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