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Accounting Policies - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
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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, 2012 | Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2011 | Sep. 30, 2010 | Dec. 31, 2013 Y | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation over life to cost of revenues and selling and administrative expenses, years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |
Net book value of internally manufactured test systems sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000 | $ 6,000,000 | $ 7,800,000 |
Percentage of common stock price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% | 85.00% | 85.00% |
Stock options term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |
Restricted stock unit awards granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |
Restricted stock unit award granted after one year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Award vesting on the first anniversary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Maximum percent of shares allowed to purchase | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |
Fair market value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000 |  |  |
Maximum number of shares allowed to purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000 |  |  |
Stock options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 213,000 | 151,000 | 145,000 |
Weighted average grant date fair value |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.42 | $ 4.09 | $ 4.01 | $ 3.66 |  | $ 6.09 | $ 6.85 | $ 6.74 |
Number of shares available for grant | 14,213,000 |  |  |  |  | 6,414,000 |  |  |  |  |  |  | 6,414,000 |  | 8,205,000 |  |  | 14,213,000 | 6,414,000 | 8,205,000 | 9,851,000
Income tax (benefit) provision | 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) |
Advertising costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 | 1,600,000 | 1,000,000 |
Gains and losses on foreign exchange contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,900,000 | 4,500,000 | 900,000 |
Exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.48 |  |  |  |
Call option, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,700,000 |  |  |  |
Warrant price | 7.67 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.67 |  |  |
Foreign currency translation reclassification adjustment included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,266,000 |
Discrete Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax (benefit) provision |  |  |  |  | $ 6,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of common stock price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Period of stock granted to employees and executive officers vest in equal installments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for grant | 6,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,400,000 |  |  |
[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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