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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Line Items]      
Operating loss carryforwards $ 1,100.0    
Unrecognized tax benefits 924.1 [1] $ 781.2 [1] $ 988.1
Reasonably possible amount of unrecognized tax benefits decrease within the next 12 months - minimum 250.0    
Effective tax rate adjustment 630.0    
Accrued interest and penalties related to income tax matters 117.0 83.6  
Provision for income taxes, interest and penalties expense related to tax matters 41.7 $ 21.1 $ 87.9
Temporary difference for which deferred U.S. income taxes have not been recorded 16,000.0    
Minimum      
Income Taxes [Line Items]      
Effective tax rate adjustment 10.0    
Indefinite [Member]      
Income Taxes [Line Items]      
Operating loss carryforwards $ 800.0    
[1] Of this amount, $890.0 million and $704.0 million are included in Other long-term liabilities for 2016 and 2015, respectively, and $9.0 million and $21.9 million are included in Current liabilities - income taxes for 2016 and 2015, respectively, on the consolidated balance sheet. The remainder is included in Deferred income taxes on the consolidated balance sheet.