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Taxes On Income - Additional Information (Detail) $ in Thousands, ₪ in Billions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 01, 2018 | Mar. 31, 2017 ILS (₪) | Jan. 01, 2017 | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 | Dec. 31, 2010
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Corporate tax rate |  |  |  | 25.00% | 26.50% | 26.50% |  |
Total revenues |  |  |  | $ 1,741,301 | $ 1,629,838 | $ 1,495,816 |  |
Minimum obligation to invest during five years period |  |  |  |  |  | 111,000 |  |
Undistributed earnings of foreign subsidiaries |  |  |  | 217,045 |  |  |  |
Unrecognized deferred tax liability on undistributed earnings of foreign subsidiaries |  |  |  | 37,282 |  |  |  |
Unrecognized tax benefit liability adjusted within 12 months |  |  |  | 43,661 |  |  |  |
Uncertain tax positions interest expense |  |  |  | 6,025 | 7,534 | $ 6,214 |  |
Uncertain tax positions accrued interest |  |  |  | 21,051 | $ 17,413 |  |  |
Minimum |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Dividend income tax rate |  |  |  |  |  |  | 15.00% |
Maximum |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Dividend income tax rate |  |  |  |  |  |  | 20.00% |
Israel | Subsequent Event |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Reduction of corporate tax rate |  |  | 24.00% |  |  |  |  |
Israel | Scenario, Forecast |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Reduction of corporate tax rate | 23.00% |  |  |  |  |  |  |
U S Federal |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
U.S. federal loss carry forward |  |  |  | $ 501,047 |  |  |  |
Operating loss carry forward expiration years |  |  |  | 2020 |  |  |  |
U S State |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
U.S. federal loss carry forward |  |  |  | $ 139,768 |  |  |  |
U S State | Minimum |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating loss carry forward expiration years |  |  |  | 2017 |  |  |  |
U S State | Maximum |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating loss carry forward expiration years |  |  |  | 2034 |  |  |  |
Research And Development Tax Credit |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
U.S. federal loss carry forward |  |  |  | $ 18,764 |  |  |  |
Research And Development Tax Credit | Minimum |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating loss carry forward expiration years |  |  |  | 2019 |  |  |  |
Research And Development Tax Credit | Maximum |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating loss carry forward expiration years |  |  |  | 2035 |  |  |  |
January 1, 2014 thereafter |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Enacted effective income tax rate |  |  |  |  |  |  |  | 16.00%
Technological Preferred Enterprise | Scenario, Forecast |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Enacted effective income tax rate |  | 12.00% |  |  |  |  |  |
Technological Preferred Enterprise | Maximum | Scenario, Forecast |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Total revenues | ₪ |  | ₪ 10 |  |  |  |  |  |

X
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