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Consolidated Quarterly Statements of Operations (Parenthetical) (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Defined Benefit Pension And Post Retirement Benefit Plans | Dec. 31, 2012 Defined Benefit Pension And Post Retirement Benefit Plans | Jun. 30, 2012 Semiconductor Test Employee | Dec. 31, 2011 Semiconductor Test Employee | Jun. 30, 2012 Litepoint Corporation | Mar. 31, 2012 Litepoint Corporation
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity interest | $ 34,200,000 |  |  |  |  |  |  |  |  |  |
Income tax provision (benefit) errors |  | 200,000 | 36,975,000 | 48,927,000 | (125,225,000) |  |  |  |  |  |
Decreased gross profit |  |  |  |  |  | 2,700,000 | (8,100,000) |  |  |  |
Decrease in net income |  |  |  |  |  | 9,100,000 | (18,300,000) |  |  |  |
Pension settlement charges |  |  |  |  |  |  |  |  |  | (6,500,000) | (1,800,000)
Severance benefit and charges |  |  | $ 500,000 |  |  |  |  | $ 300,000 | $ 1,200,000 |  |
Reduction in employees headcount |  |  |  |  |  |  |  | 10 | 7 |  |

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