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Accounting Policies - Additional Information (Detail) (USD $) | 6 Months Ended | 9 Months Ended | 12 Months Ended |
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Dec. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2011 | Dec. 31, 2010 | Jun. 30, 2010 | Sep. 30, 2010 | Dec. 31, 2012 Y | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
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 |  |  |  |  |  |  |  | $ 6,000,000 | $ 7,800,000 | $ 12,200,000 |
Common stock purchase percentage |  |  |  |  |  |  |  | 100.00% |  |  |
Grant date time period,maximum |  |  |  |  |  |  |  | 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% |  |  |
Regular payroll deductions under ESPP | 10.00% |  |  |  |  |  |  | 10.00% |  |  |
Maximum of shares value authorized for purchase |  |  |  |  |  |  |  | 25,000 |  |  |
Maximum shares based compensation | 6,000 |  |  |  |  |  |  | 6,000 |  |  |
Fair market value common stock price percentage |  |  |  |  |  |  |  | 85.00% |  |  |
Common stock price, percentage |  |  |  |  |  |  |  | 85.00% |  |  |
Stock options granted | 200,000 |  | 100,000 |  | 300,000 |  |  | 200,000 | 100,000 | 300,000 |
Weighted average grant date fair value | $ 3.42 | $ 4.09 | $ 4.01 | $ 3.66 | $ 2.77 | $ 3.05 |  | $ 6.85 | $ 6.74 | $ 4.10 |
Number of shares available for grant | 6,414,000 |  | 8,205,000 |  | 9,851,000 |  |  | 6,414,000 | 8,205,000 | 9,851,000 | 12,653,000
Discrete benefit not recognized | 17,467,000 |  | 19,678,000 |  | 12,028,000 |  |  | 17,467,000 | 19,678,000 | 12,028,000 | 12,767,000
Advertising costs |  |  |  |  |  |  |  | 1,600,000 | 1,000,000 | 600,000 |
Gains and losses on foreign exchange contracts |  |  |  |  |  |  |  | 4,500,000 | 900,000 | 2,500,000 |
Exercise price |  |  |  |  |  |  | $ 5.48 |  |  |  |
Call option, shares |  |  |  |  |  |  | 34,700,000 |  |  |  |
Warrant price |  |  |  |  |  |  |  | $ 7.67 |  |  |
Discrete Tax |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discrete benefit not recognized | $ 7,000,000 |  |  |  |  |  |  | $ 7,000,000 |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock price, percentage |  |  |  |  |  |  |  | 85.00% |  |  |
Number of shares available for grant | 2,800,000 |  |  |  |  |  |  | 2,800,000 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Grant date time period, minimum |  |  |  |  |  |  |  | 4 years |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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