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Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Carry forward tax losses | $ 106,481 | $ 188,301
Employee stock based compensation | 25,117 | 30,835
Other | 73,048 | 81,959
Deferred tax assets before valuation allowance | 204,646 | 301,095
Valuation allowance - mainly in respect to carryforward losses | (60,703) | (181,947)
Deferred tax asset | 143,943 | 119,148
Intangible assets | (8,862) | (8,461)
Undistributed earnings of subsidiary | (9,925) | (9,925)
Other | (274) | (13)
Deferred tax liability | (19,061) | (18,399)
Deferred tax asset, net | $ 124,882 | $ 100,749

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96869850&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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