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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