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Change in Accounting Principle - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Change In Accounting Principle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income before accounting changes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 207,000,000 |  |
Net income | $ (16,543,000) | [1],[2],[3] | $ 88,641,000 | [4] | $ 111,387,000 | [5] | $ 33,564,000 | [6] | $ 129,071,000 | [7],[8] | $ 56,706,000 | [9] | $ 87,252,000 | [10] | $ 96,844,000 | [11] | $ 217,049,000 | $ 369,873,000 | $ 384,820,000
Earnings per share diluted before accounting charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.90 |  |
Diluted | $ (0.09) | [1],[2],[3] | $ 0.39 | [4] | $ 0.49 | [5] | $ 0.15 | [6] | $ 0.58 | [7],[8] | $ 0.26 | [9] | $ 0.38 | [10] | $ 0.42 | [11] | $ 0.94 | $ 1.63 | $ 1.75
[1] | Restructuring and other, net includes a ($0.4) million fair value adjustment to decrease LitePoint acquisition contingent consideration.
[2] | 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.
[3] | In the fourth quarter ended December 31, 2012, the change in recognizing pension and postretirement benefit plans expense, as a result of the mark-to-market adjustments, 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.
[4] | Restructuring and other, net includes $0.7 million of severance charges related to the headcount reductions of 9 people, of which $0.5 million and 7 people were in Systems Test Group, $0.2 million and 2 people were in Wireless Test.
[5] | Restructuring and other, net 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, net includes a ($1.8) million fair value adjustment to decrease the LitePoint acquisition contingent consideration.
[7] | Restructuring and other, net includes $0.5 million of charges related to pension settlement and $3.3 million to the acquisition of LitePoint.
[8] | In the fourth quarter ended December 31, 2011, the change in recognizing pension and postretirement benefit plans expense, as a result of the mark-to-market adjustments, decreased gross profit and net income by $2.4 million and $6.1 million, respectively. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[9] | Restructuring and other, net includes $1.4 million of charges related to the acquisition of LitePoint.
[10] | Restructuring and other, net includes $0.3 million of severance charges related to headcount reductions of approximately 2 people in Semiconductor Test and $0.7 million related to pension settlement charges.
[11] | Restructuring and other, net includes $0.8 million of severance charges related to headcount reductions of approximately 5 people in Semiconductor Test and $(0.4) million credit related to early exit of previously impaired leased facilities in Westford and North Reading, Massachusetts.

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