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Schedule of Condensed Consolidated Statements of Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
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 | $ (16,543) | [1],[2],[3] | $ 88,641 | [4] | $ 111,387 | [5] | $ 33,564 | [6] | $ 129,071 | [7],[8] | $ 56,706 | [9] | $ 87,252 | [10] | $ 96,844 | [11] | $ 217,049 | $ 369,873 | $ 384,820
Foreign currency translation reclassification adjustment included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,266 | (349)
Unrealized gains on marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,307 | (3) | 1,559
Prior service cost arising during period, net of tax of $0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,279
Prior service costs, net of tax of $9 in 2011 and $0 in 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (233) | 14 | 310
Defined benefit pension and post-retirement plans, total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (233) | 14 | 3,589
Other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,074 | 2,277 | 4,799
Comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 218,123 | 372,150 | 389,619
Originally Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change In Accounting Principle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 373,809 | 379,730
Foreign currency translation reclassification adjustment included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,266 | (349)
Unrealized gains on marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) | 1,559
Actuarial gain (loss) arising during period, net of tax of(3,427) and 3,427 in 2010 and ($1,826) and $1,826 in 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9,496) | (288)
Prior service cost arising during period, net of tax of $0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,279
Actuarial losses, net of tax of $3,385, ($3,385) in 2011 and $133, ($133) in 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,560 | 5,378
Prior service costs, net of tax of $9 in 2011 and $0 in 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 310
Defined benefit pension and post-retirement plans, total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,574 | 5,688
Other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,659) | 9,889
Comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 372,150 | 389,619
Effect Of Accounting Change |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change In Accounting Principle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,936) | 5,090
Actuarial gain (loss) arising during period, net of tax of(3,427) and 3,427 in 2010 and ($1,826) and $1,826 in 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,496 | 288
Actuarial losses, net of tax of $3,385, ($3,385) in 2011 and $133, ($133) in 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,560) | (5,378)
Defined benefit pension and post-retirement plans, total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,560) | (5,378)
Other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,936 | (5,090)
As Adjusted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change In Accounting Principle |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 369,873 | 384,820
Foreign currency translation reclassification adjustment included in net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,266 | (349)
Unrealized gains on marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3) | 1,559
Prior service cost arising during period, net of tax of $0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,279
Prior service costs, net of tax of $9 in 2011 and $0 in 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 310
Defined benefit pension and post-retirement plans, total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 | 310
Other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,277 | 4,799
Comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 372,150 | $ 389,619
[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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- Definition Net of tax and reclassification adjustments of the change in the balance sheet adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity. Also includes the following: gain (loss) on foreign currency forward exchange contracts; foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; and gain (loss) on a derivative instrument or nonderivative financial instrument that may give rise to a foreign currency transaction gain (loss) that has been designated and qualified as a hedging instrument for hedging of the foreign currency exposure of a net investment in a foreign operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b,c) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 + Details
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- Definition Net of tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669619-108580 + Details
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- Definition Net of tax and reclassifications amount of pension and other postretirement benefit plans (gain) loss included in accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580 + Details
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