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Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Increase (decrease) in adoption of new accounting guidance amount | $ 387,414 | $ (241,918) |  |
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 | $ 7,300 | 5,000 | $ 3,800 |
Advertising costs | 12,800 | 16,600 | 15,400 |
Losses (gains) on foreign currency transactions | (2,600) | 1,600 | $ 2,500 |
Trade Accounts Receivable | $ 131,100 | $ 143,600 |  |
Retained Earnings | ASU 2016-01 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Increase (decrease) in adoption of new accounting guidance amount |  |  |  | $ 3,100
Accumulated Other Comprehensive Income (Loss) | ASU 2016-01 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Increase (decrease) in adoption of new accounting guidance amount |  |  |  | $ 3,100

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