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Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | [3],[4] | Jul. 01, 2018 | [3],[5] | Apr. 01, 2018 | [6] | Dec. 31, 2017 | Oct. 01, 2017 | [8],[9] | Jul. 02, 2017 | [8],[10] | Apr. 02, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized in accordance with ASC 606 | [1] |  |  |  |  |  |  |  |  |  |  |  | $ 2,100,802 | $ 2,136,606 | $ 1,753,250 |
Revenue on leases |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,800 | 3,600 | 11,400 |
Cumulative effect adjustment to increase retained earnings and deferred tax assets |  | $ 12,679 |  |  |  |  |  |  |  |  |  |  | 12,679 |  |  |
Income tax provision (benefit) |  | (32,662) | [2],[3] | $ 20,863 | $ 18,975 | $ 8,846 | $ 204,007 | [7],[8] | $ 24,017 | $ 31,901 | $ 6,795 | [11] | 16,022 | 266,720 | (11,639) |
Advertising costs |  |  |  |  |  |  |  |  |  |  |  |  | 15,400 | 9,100 | 6,400 |
Losses (gains) on foreign currency transactions |  |  |  |  |  |  |  |  |  |  |  |  | (2,400) | 2,900 | (8,000) |
Trade Accounts Receivable |  | 52,200 |  |  |  |  | 5,400 |  |  |  |  |  | 52,200 | 5,400 |  |
Deferred Revenue And Customer Advances |  | $ 110,461 |  |  |  |  | $ 113,741 |  |  |  |  |  | $ 110,461 | 113,741 |  |
Short-term Contract with Customer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Percentage |  | 70.00% |  |  |  |  |  |  |  |  |  |  | 70.00% |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |
Long-term Contract with Customer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Percentage |  | 25.00% |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |
Long-term Contract with Customer [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Long-term Contract with Customer [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction Period |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized in accordance with ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,088,800 |  |  |
ASU 2016-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect adjustment to increase retained earnings and deferred tax assets |  |  |  |  |  |  |  |  |  |  | $ 39 |  |  |  |  |
Income tax provision (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,300) |  |
ASU 2017-07 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in income from operations |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (5,000) | $ (3,000) |
Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative effect adjustment to increase retained earnings and deferred tax assets |  | $ 12,679 |  |  |  |  |  |  |  |  |  |  | $ 12,679 |  |  |
Retained Earnings | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in adoption of new accounting guidance amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,700
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)
[1] | Revenues attributable to a country are based on location of customer site.
[2] | Restructuring and other includes a $17.7 million fair value adjustment to increase the MiR acquisition contingent consideration, $0.8 million of employee severance charges, and $0.5 million acquisition related expenses and compensation, partially offset by a $7.4 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability.
[3] | Teradyne recorded pension and post retirement net actuarial (gains) losses of $(0.1) million, $0.3 million and $(3.5) million for the second, third and fourth quarter in 2018, respectively. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[4] | Restructuring and other includes $1.7 million of employee severance charges, $0.8 million of acquisition related expenses and compensation, partially offset by a $0.8 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability.
[5] | Restructuring and other includes a $5.0 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $3.9 million of employee severance charges and $0.8 million of acquisition related expenses and compensation.
[6] | Restructuring and other includes a $3.5 million gain for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $2.5 million of acquisition related expenses and compensation and $2.4 million of employee severance charges.
[7] | Restructuring and other includes a $6.0 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, $1.8 million of employee severance charges, and $1.1 million of charges for impairment of fixed assets.
[8] | Teradyne recorded pension and post retirement net actuarial gains of $2.8 million and $3.8 million for the second and fourth quarter in 2017, respectively. See Note B: “Accounting Policies” for a discussion of Teradyne’s accounting policy.
[9] | Restructuring and other includes $5.1 million of property insurance recovery related to the Japan earthquake, a $0.4 million credit related to previously impaired lease termination of a Wireless Test facility in Sunnyvale, CA, and a $0.3 million credit for the decrease in the fair value of the Universal Robots contingent consideration liability, partially offset by $0.8 million of Japan earthquake related expenses and $0.6 million of employee severance charges.
[10] | Restructuring and other includes a $1.5 million charge for a fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.8 million of employee severance charges.
[11] | Restructuring and other includes a $1.3 million charge for a lease impairment of a Wireless Test facility in Sunnyvale, CA, a $0.6 million fair value adjustment to increase the Universal Robots acquisition contingent consideration, and $0.6 million of employee severance charges.

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