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Summary of Accounting Policies - Narrative (Details) | 12 Months Ended
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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 |

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