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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Income Taxes [Line Items] |  |  |  |
Income tax expense (benefit) from continuing operations, total | $ 48,927,000 | $ (129,536,000) | $ 16,655,000 |
Valuation allowance includes net deferred tax assets | 55,400,000 | 51,100,000 |  |
Valuation allowance amount decreased | 4,400,000 | 190,200,000 | 60,000,000 |
U.S. Federal Operating Loss Carryforwards | 22,354,000 |  |  |
Net operating loss carryforward excess tax deductions related to stock based compensation | 0 |  |  |
Tax credit carry forwards, approximately | 119,000,000 |  |  |
Tax credits carry forwards | 64,123,000 | 76,248,000 |  |
Alternative minimum tax credits carryforwards | 6,600,000 |  |  |
Tax savings due to the tax holiday | 10,900,000 | 200,000 | 0 |
Tax savings due to the tax holiday, per share | $ 0.05 | $ 0.00 | $ 0.00 |
Unrecognized tax benefits | 17,467,000 | 19,678,000 | 12,028,000 | 12,767,000
Unrecognized tax benefits, if recognized would impact effective tax rate | 14,800,000 |  |  |
Unrecognized tax benefits, if recognized would impact valuation allowance | 2,700,000 |  |  |
Decrease in unrecognized tax benefits | 300,000 |  |  |
Deferred tax liability not been established | 10,600,000 |  |  |
General Business Tax Credit Carryforward |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credits carry forwards | 15,500,000 |  |  |
Foreign Country |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credits carry forwards | 42,500,000 |  |  |
State and Local Jurisdiction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credits carry forwards | 54,400,000 |  |  |
American Taxpayer Relief Act of Twenty Twelve |  |  |  |
Income Taxes [Line Items] |  |  |  |
Unrecognized tax benefits | 7,000,000 |  |  |
GenRad, Inc. |  |  |  |
Income Taxes [Line Items] |  |  |  |
U.S. Federal Operating Loss Carryforwards | $ 22,400,000 |  |  |
Minimum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforward, expiration date | 2028 |  |  |
Foreign tax carryforward, expiration date | 2013 |  |  |
Maximum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforward, expiration date | 2031 |  |  |
Foreign tax carryforward, expiration date | 2022 |  |  |

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