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Income Taxes - Deferred Income Tax Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
Research and development expenses $ 191,057 $ 189,694
Loss carryforwards 150,270 172,347
Deferred compensation 211,538 233,434
Tax credit carryforwards 98,832 91,530
Deferred Tax Assets, Tax Credit Carryforwards, Other 50,309 54,674
Postretirement benefits 48,648 50,235
Intangible assets 14,035 30,803
Other 71,453 68,604
Gross deferred income tax assets 836,142 891,321
Intangible assets (305,818) (298,444)
Other (2,905) (3,868)
Gross deferred income tax liabilities (308,723) (302,312)
Deferred income tax asset valuation allowances (77,334) (133,297)
Net deferred income tax assets $ 450,085 $ 455,712