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Income Taxes (Narrative) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 03, 2015
Income Tax Expense (Benefit), Continuing Operations [Abstract]        
Reduction to current tax expense   $ 35,400    
Valuation Allowance Recorded $ 305,300 339,800 $ 143,500  
Income Tax Reconciliation Tax Settlements [Abstract]        
Settlement of U.S. Federal and state tax examinations   28,900 20,200  
Deferred Tax Assets Net Current Classification [Abstract]        
Foreign deferred tax liabilities 9,300 13,600    
Foreign net operating loss carryforwards 134,700      
Net deferred tax liabilities (1,554,898) (1,526,095)    
Deferred Tax Assets Operating Loss Carryforwards Components [Abstract]        
Net operating loss carryforwards (tax effected) 1,400,000      
Deferred tax assets related to stock-based compensation expense included in net deferred tax liabilities 30,900      
Foreign income before taxes 49,900 97,200 $ 48,300  
Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued [Abstract]        
Interest and penalties accrued related to unrecognized tax benefits 45,000 40,800    
Total unrecognized tax benefits and accrued interest and penalties 148,200 147,700    
Portion of unrecognized tax benefits, interest and penalties recorded in "Other long-term liabilities" 113,600 110,400    
Noncurrent portion of unrecognized tax benefits netted against deferred tax assets 34,600 35,000    
Unrecognized tax benefits that would impact effective tax rate 54,300 68,800    
Portion of unrecognized tax benefits included in "Accrued Expenses" $ 0 $ 2,300    
Effective tax rate (13.00%) (8.00%) 17.00%  
Federal and State Net Operating Losses [Member]        
Valuation Allowance [Abstract]        
Valuation Allowance $ 792,400      
Foreign Net Operating Loss Carryforwards [Member]        
Valuation Allowance [Abstract]        
Valuation Allowance 132,100     $ 8,800
Other Foreign Deferred Tax Assets [Member]        
Valuation Allowance [Abstract]        
Valuation Allowance $ 20,100