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Summary of Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
reporting_unit
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Summary Of Accounting Policies [Line Items]      
Income tax benefit $ (62,951,000) $ (282,007,000) $ (306,278,000)
Allowance for doubtful accounts receivable and sales returns and allowances net current 12,700,000 14,500,000  
Cash equivalents $ 0 $ 0  
Antidilutive securities excluded from computation of earnings per share, amount | shares 477,898 1,144,350 618,220
Foreign currency transaction gain (loss), before tax $ (1,400,000) $ (2,900,000) $ (700,000)
Number of reporting units | reporting_unit 33    
Goodwill $ 8,820,313,000 8,647,142,000 5,824,726,000
Number of reporting units not requiring goodwill impairment | reporting_unit 31    
Number of reporting units requiring goodwill impairment | reporting_unit 2    
Research and development expense $ 281,100,000 195,400,000 164,200,000
Contracts revenue percentage of completion 249,000,000 241,000,000 $ 253,000,000
Capitalized computer software, net 14,000,000 4,400,000  
Minimum      
Summary Of Accounting Policies [Line Items]      
Goodwill 0    
Maximum      
Summary Of Accounting Policies [Line Items]      
Goodwill $ 2,300,000,000    
Adjustments for New Accounting Principle, Early Adoption      
Summary Of Accounting Policies [Line Items]      
Income tax benefit   $ 15,300,000  
Weighted average number diluted shares outstanding adjustment | shares   278,829