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Taxes On Income - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2013 | Dec. 31, 2010 | Dec. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Corporate tax rate |  |  | 24.00% | 25.00% | 26.50% |  |  |
Minimum obligation to invest during five years period |  |  |  |  |  |  |  | $ 111,000,000
Corporate tax rate |  |  | 24.00% | 25.00% | 26.50% |  |  |
Estimated tax benefit related to re-measurement of deferred tax balance |  |  | $ 41,084,000 |  |  |  |  |
Undistributed earnings of foreign subsidiaries |  |  | 346,675,000 |  |  |  |  |
Unrecognized deferred tax liability on undistributed earnings of foreign subsidiaries |  |  | 56,706,000 |  |  |  |  |
Unrecognized tax benefit liability adjusted within 12 months |  |  | 58,198,000 |  |  |  |  |
Uncertain tax positions interest expense |  |  | 4,168,000 | $ 6,025,000 | $ 7,534,000 |  |  |
Uncertain tax positions accrued interest |  |  | 25,219,000 | 21,051,000 |  |  |  |
Penalties accrued |  |  | $ 0 | $ 0 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Reduction of corporate tax rate | 23.00% |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Dividend income tax rate |  |  |  |  |  | 20.00% |  |
Minimum |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Dividend income tax rate |  |  |  |  |  | 15.00% |  |
U.S. |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Corporate tax rate |  |  | 35.00% |  |  |  |  |
U.S. | Scenario, Plan |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Corporate tax rate |  | 21.00% |  |  |  |  |  |
U S Federal |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
U.S. loss carry forward |  |  | $ 452,795,000 |  |  |  |  |
Operating loss carry forward expiration years |  |  | 2020 |  |  |  |  |
U S State |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
U.S. loss carry forward |  |  | $ 118,476,000 |  |  |  |  |
U S State | Maximum |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating loss carry forward expiration years |  |  | 2024 |  |  |  |  |
U S State | Minimum |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating loss carry forward expiration years |  |  | 2018 |  |  |  |  |
Research And Development Tax Credit |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
U.S. loss carry forward |  |  | $ 19,250,000 |  |  |  |  |
Research And Development Tax Credit | Maximum |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating loss carry forward expiration years |  |  | 2037 |  |  |  |  |
Research And Development Tax Credit | Minimum |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating loss carry forward expiration years |  |  | 2019 |  |  |  |  |
Tax Year 2012 |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Enacted effective income tax rate |  |  |  |  |  |  | 16.00% |
Technological Preferred Enterprise |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Enacted effective income tax rate |  |  | 12.00% |  |  |  |  |

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- Definition The portion of the difference between the domestic federal statutory income tax rate and the expected income tax expense or benefit that is attributable to reduced tax rates (resulting from the effect of "Approved, Privileged or Preferred Enterprise" status). + References No definition available. + Details
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