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Income Taxes - Narrative (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Dec. 31, 2014
Income Taxes [Line Items]            
Loss carryforwards   $ 632,915        
Tax credit carryforwards   222,353        
Deferred income tax asset valuation allowances $ 74,125 $ 579,245 $ 74,125      
Percentage greater than threshold of Income tax examination of uncertain tax positions that should be recognized   50.00%        
Net deferred income tax assets 450,618 $ 12,252 450,618      
Excess tax benefit, amount 4,300          
Unrecognized tax benefits, end of period 109,347 116,070 109,347 $ 118,099   $ 100,357
Amount of unrecognized tax benefits that would impact the effective tax rate if recognized   112,300        
Amount of unrecognized tax benefits that would impact the effective tax rate if recognized and increase the valuation allowance   66,800        
Increase (decrease) in recognized interest and penalties related to unrecognized tax benefits   2,000 (2,000) 0    
Accrued interest and penalties related to unrecognized tax benefits $ 17,100 18,600 17,100      
Amount of unrecognized tax benefits related to interest and penalties that would impact the effective tax rate if recognized   17,700        
Reasonably possible changes to unrecognized tax benefits related to settlement of tax audits and/or expiration of statutes of limitations within the next twelve months   (27,600)        
Net tax benefit   454,400 $ 16,800 $ 19,100    
Cumulative amount of undistributed earnings of foreign subsidiaries that is intended to be indefinitely reinvested and for which no deferred US income taxes have been provided   7,000,000        
Income tax expense (benefit) adjustment for the Tax Act   (105,300)        
Income tax expense (benefit) adjustment for the Tax Act related to remeasurement of the deferred tax liabilities   52,300        
Income tax expense (benefit) adjustment for the Tax Act related to deferred tax netting   53,000        
Valuation Allowance for Other Deferred Tax Assets            
Income Taxes [Line Items]            
Deferred income tax asset valuation allowances   511,800     $ 561,900  
Foreign | Valuation Allowance for Other Deferred Tax Assets            
Income Taxes [Line Items]            
Deferred income tax asset valuation allowances   $ 67,400