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Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | May 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 02, 2015
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 1,478,257 |  | $ 1,385,995 | $ 1,385,115 |
Thinklogical Holdings LLC [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash |  | $ 5,376 |  |  |
Receivables |  | 4,355 |  |  |
Inventory |  | 16,424 |  |  |
Prepaid and other current assets |  | 320 |  |  |
Property, plant, and equipment |  | 4,289 |  |  |
Goodwill |  | 71,394 |  |  |
Intangible assets |  | 73,400 |  |  |
Total assets |  | 175,558 |  |  |
Accounts payable |  | 1,231 |  |  |
Accrued liabilities |  | 1,353 |  |  |
Deferred revenue |  | 1,702 |  |  |
Total liabilities |  | 4,286 |  |  |
Net assets |  | $ 171,272 |  |  |
Tripwire [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash |  |  |  |  | $ 2,364
Receivables |  |  |  |  | 37,792
Inventory |  |  |  |  | 603
Other current assets |  |  |  |  | 2,453
Property, plant, and equipment |  |  |  |  | 10,021
Goodwill |  |  |  |  | 462,215
Intangible assets |  |  |  |  | 306,000
Other non-current assets |  |  |  |  | 659
Total assets |  |  |  |  | 822,107
Accounts payable |  |  |  |  | 3,142
Accrued liabilities |  |  |  |  | 12,142
Deferred revenue |  |  |  |  | 8,000
Deferred income taxes |  |  |  |  | 95,074
Other non-current liabilities |  |  |  |  | 540
Total liabilities |  |  |  |  | 118,898
Net assets |  |  |  |  | $ 703,209

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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