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Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Carry forward tax losses $ 191,561 $ 213,880
Employee stock based compensation 27,517 23,950
Other 60,887 46,356
Deferred tax assets before valuation allowance 279,965 284,186
Valuation allowance (192,332) (213,690)
Deferred tax asset 87,633 70,496
Intangible assets (8,045) (7,901)
Undistributed earnings of subsidiary (11,435) (11,435)
Other (2,682) (3,121)
Deferred tax liability (22,162) (22,457)
Deferred tax asset, net $ 65,471 $ 48,039