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Restructuring and Other - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Sep. 30, 2012 Employee | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2012 Semiconductor Test Employee | Jun. 30, 2011 Semiconductor Test Employee | Mar. 31, 2011 Semiconductor Test Employee | Sep. 30, 2012 Systems Test Group Employee | Sep. 30, 2012 Wireless Test Employee | Jun. 30, 2012 Q1 2011 Actions Semiconductor Test Employee | Dec. 31, 2011 Q1 2011 Actions Semiconductor Test Employee | Dec. 31, 2011 Q2 2011 Actions Semiconductor Test Employee | Dec. 31, 2011 Q2 2010 Actions Semiconductor Test | Dec. 31, 2010 Q2 2010 Actions Systems Test Group Employee | Dec. 31, 2011 Q4 2010 Actions Semiconductor Test | Dec. 31, 2010 Q4 2010 Actions Systems Test Group Employee | Dec. 31, 2011 Pre-2010 Activities | Dec. 31, 2010 Pre-2010 Activities | Dec. 31, 2010 Pre-2010 Activities Systems Test Group | Dec. 31, 2010 Pre-2010 Activities Semiconductor Test And System Test Group | Dec. 31, 2010 Q1 2010 Actions Semiconductor Test Employee | Dec. 31, 2010 Q3 2010 Actions Systems Test Group Employee | Dec. 31, 2010 Foreign Pension Plans, Defined Benefit
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, contingent consideration |  | $ 68,500,000 | $ 8,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition, contingent consideration paid |  |  | 59,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and other charges |  |  | 5,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Cost |  |  | 4,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension Settlement non US |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other gains related to pension settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000
Remaining accrual for lease payments |  | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance benefit and charges | 700,000 | 200,000 |  | 300,000 | 300,000 | 800,000 | 500,000 | 200,000 | 300,000 | 600,000 | 300,000 | 200,000 | 900,000 | 100,000 | 100,000 |  |  | (200,000) | 500,000 | 400,000 | 400,000 |
Lease expiration date |  | Dec. 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unoccupied space subleased |  | 37.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in employees head count | 9 |  |  | 10 | 2 | 5 | 7 | 2 | 10 | 5 | 2 |  | 6 |  | 1 |  |  |  |  | 4 | 10 |
Early exit of leased facility |  |  |  |  |  | $ (400,000) |  |  |  |  |  |  |  |  |  | $ (500,000) | $ (2,700,000) |  |  |  |  |

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