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Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Carry forward tax losses $ 90,099 $ 106,481
Employee stock based compensation 19,275 25,117
Deferred revenues 22,153 19,200
Other 53,243 53,848
Deferred tax assets before valuation allowance 184,770 204,646
Valuation allowance - mainly in respect to carryforward losses (55,745) (60,703)
Deferred tax asset 129,025 143,943
Intangible assets (11,335) (8,862)
Undistributed earnings of subsidiary (9,925) (9,925)
Other (4,663) (274)
Deferred tax liability (25,923) (19,061)
Deferred tax asset, net $ 103,102 $ 124,882