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Income Taxes - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2013 | Sep. 29, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) from continuing operations, total | $ 13,096,000 | [1],[2] | $ 18,093,000 | $ 13,801,000 | $ (8,015,000) | $ (13,742,000) | [3],[4] | $ 14,384,000 | $ 40,605,000 | [5] | $ 7,680,000 | [6] | $ 36,975,000 | $ 48,927,000 | $ (129,536,000) |
U.S. research and development tax credit reduction Percentage |  |  |  |  |  |  |  |  |  |  |  |  | (7.20%) |  | (1.10%) |
U.S. statutory federal tax rate |  |  |  |  |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00% |
Tax savings due to the tax holiday |  |  |  |  |  |  |  |  |  |  |  |  | 4,700,000 | 10,900,000 | 200,000 |
Tax savings due to the tax holiday, per share |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.02 | $ 0.05 | $ 0.00 |
Accrued interest and penalties | 400,000 |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |
Valuation allowance amount decrease/increase |  |  |  |  |  |  |  |  |  |  |  |  | (19,500,000) | 4,400,000 | (190,200,000) |
Valuation allowance includes net deferred tax assets | 40,386,000 |  |  |  |  | 55,446,000 |  |  |  |  |  |  | 40,386,000 | 55,446,000 |  |
U.S. Federal operating loss carryforwards | 19,354,000 |  |  |  |  |  |  |  |  |  |  |  | 19,354,000 |  |  |
Net operating loss carryforward excess tax deductions related to stock based compensation | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Tax credit carry forwards, approximately | 133,400,000 |  |  |  |  |  |  |  |  |  |  |  | 133,400,000 |  |  |
Tax credits carry forwards | 65,210,000 |  |  |  |  | 64,123,000 |  |  |  |  |  |  | 65,210,000 | 64,123,000 |  |
Alternative minimum tax credits carryforwards | 6,600,000 |  |  |  |  |  |  |  |  |  |  |  | 6,600,000 |  |  |
Unrecognized tax benefits | 21,203,000 |  |  |  |  | 18,666,000 |  |  |  |  |  |  | 21,203,000 | 18,666,000 | 19,391,000 | 11,777,000
Unrecognized tax benefits, if recognized would impact effective tax rate | 16,000,000 |  |  |  |  |  |  |  |  |  |  |  | 16,000,000 |  |  |
Unrecognized tax benefits, if recognized would impact valuation allowance | 5,200,000 |  |  |  |  |  |  |  |  |  |  |  | 5,200,000 |  |  |
Decrease in unrecognized tax benefits |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |
Deferred tax liability not been established | 320,000,000 |  |  |  |  |  |  |  |  |  |  |  | 320,000,000 |  |  |
General Business Tax Credit Carryforward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credits carry forwards | 27,700,000 |  |  |  |  |  |  |  |  |  |  |  | 27,700,000 |  |  |
Foreign |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credits carry forwards | 34,500,000 |  |  |  |  |  |  |  |  |  |  |  | 34,500,000 |  |  |
State and Local Jurisdiction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credits carry forwards | 64,600,000 |  |  |  |  |  |  |  |  |  |  |  | 64,600,000 |  |  |
Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credits carry forwards | 41,100,000 |  |  |  |  |  |  |  |  |  |  |  | 41,100,000 |  |  |
GenRad, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Federal operating loss carryforwards | 16,500,000 |  |  |  |  |  |  |  |  |  |  |  | 16,500,000 |  |  |
ZTEC Instruments, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Federal operating loss carryforwards | $ 2,800,000 |  |  |  |  |  |  |  |  |  |  |  | $ 2,800,000 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, expiration date |  |  |  |  |  |  |  |  |  |  |  |  | 2017 |  |  |
Minimum | Foreign |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, expiration date |  |  |  |  |  |  |  |  |  |  |  |  | 2018 |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, expiration date |  |  |  |  |  |  |  |  |  |  |  |  | 2033 |  |  |
Maximum | Foreign |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax credit carryforward, expiration date |  |  |  |  |  |  |  |  |  |  |  |  | 2022 |  |  |
[1] | Interest expense and other includes a $34.2 million gain from the sale of an equity investment.
[2] | In the fourth quarter ended December 31, 2013, pension and post retirement net actuarial gains increased gross profit and net income by $2.7 million and $9.1 million, respectively. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[3] | In the fourth quarter ended December 31, 2012, we corrected prior period income tax provision (benefit) errors that resulted in a $0.2 million income tax provision. These errors were not individually or in aggregate material to the fourth quarter of 2012 or any prior period.
[4] | In the fourth quarter ended December 31, 2012, pension and postretirement actuarial losses decreased gross profit and net income by $8.1 million and $18.3 million, respectively. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[5] | Restructuring and other includes $0.3 million of severance charges related to headcount reductions of 10 people in Semiconductor Test and ($6.5) million fair value adjustment to decrease the LitePoint acquisition contingent consideration.
[6] | Restructuring and other includes a ($1.8) million fair value adjustment to decrease the LitePoint acquisition contingent consideration.

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