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Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Carry forward tax losses $ 188,301 $ 191,561
Employee stock based compensation 30,835 27,517
Other 81,959 60,887
Deferred tax assets before valuation allowance 301,095 279,965
Valuation allowance (181,947) (192,332)
Deferred tax asset 119,148 87,633
Intangible assets (8,461) (8,045)
Undistributed earnings of subsidiary (9,925) (11,435)
Other (13) (2,682)
Deferred tax liability (18,399) (22,162)
Deferred tax asset, net $ 100,749 $ 65,471