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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2013 American Taxpayer Relief Act of 2012 [Member] | Dec. 31, 2013 Israeli Tax [Member] | Dec. 31, 2012 Israeli Tax [Member] | Dec. 31, 2014 Scenario, Plan [Member] Israeli Tax [Member] | Dec. 31, 2013 2015 [Member]
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Gross Massachusetts tax research other tax credit carryforwards | $ 8,689 |  |  |  |  |  |  |  |
Tax credit expiration period | 2028 |  |  |  |  |  |  |  |
U.S. Federal capital loss carryforwards |  |  |  |  |  |  |  |  | 59,275
Gross unrecognized tax benefits excluding interest and penalties | 47,684 | 40,674 | 36,540 | 22,028 |  |  |  |  |
Net unrecognized tax benefit excluding interest and penalties that would impact effective tax rate | 24,758 |  |  |  |  |  |  |  |
Net benefit to income tax expense, excluding interest and penalties, due to discrete reserve releases | 140 |  | 2,148 |  |  |  |  |  |
Accrued interest on unrecognized tax benefits | 2,159 | 1,571 | 973 |  |  |  |  |  |
Unrecognized tax benefits related to various U.S.federal, state and foreign tax positions | 12,614 |  |  |  |  |  |  |  |
Increased valuation allowance | 395 | 1,022 | 1,208 |  |  |  |  |  |
Undistributed earnings in foreign subsidiaries | 440,841 |  |  |  |  |  |  |  |
Tax holiday resulted in income tax savings |  |  | $ 1,000 | $ 2,700 |  |  |  |  |
Income tax holiday tax rate |  |  |  |  |  | 7.00% | 10.00% | 9.00% |
Reduction in effective income tax rate |  |  |  |  | 3.00% |  |  |  |

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- Definition The sum of federal capital loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws. + References No definition available. + Details
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- Definition The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 11.C) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330215-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 11 -Section C + Details
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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28446-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28511-109314 + Details
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