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Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 02, 2015 | Dec. 31, 2014 | Jun. 11, 2014 | Mar. 31, 2014
--- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 1,385,995 | $ 1,385,115 |  | $ 943,374 |  |
Tripwire [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  | $ 2,364 |  |  |
Receivables |  |  | 37,792 |  |  |
Inventories |  |  | 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 |  |  |
Prosoft Technology, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  |  |  | $ 2,517 |
Receivables |  |  |  |  | 5,894 |
Inventories |  |  |  |  | 2,731 |
Other current assets |  |  |  |  | 332 |
Property, plant and equipment |  |  |  |  | 767 |
Goodwill |  |  |  |  | 56,923 |
Intangible assets |  |  |  |  | 40,800 |
Other non-current assets |  |  |  |  | 622 |
Total assets |  |  |  |  | 110,586 |
Accounts payable |  |  |  |  | 2,544 |
Accrued liabilities |  |  |  |  | 2,807 |
Other non-current liabilities |  |  |  |  | 1,132 |
Total liabilities |  |  |  |  | 6,483 |
Net assets |  |  |  |  | $ 104,103 |
Grass Valley [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  |  |  |  | $ 9,451
Receivables |  |  |  |  |  | 67,354
Inventories |  |  |  |  |  | 18,593
Other current assets |  |  |  |  |  | 4,172
Property, plant and equipment |  |  |  |  |  | 22,460
Goodwill |  |  |  |  |  | 131,070
Intangible assets |  |  |  |  |  | 95,500
Other non-current assets |  |  |  |  |  | 17,101
Total assets |  |  |  |  |  | 365,701
Accounts payable |  |  |  |  |  | 51,276
Accrued liabilities |  |  |  |  |  | 62,672
Deferred revenue |  |  |  |  |  | 14,000
Postretirement benefits |  |  |  |  |  | 16,538
Deferred income taxes |  |  |  |  |  | 1,827
Other non-current liabilities |  |  |  |  |  | 1,199
Total liabilities |  |  |  |  |  | 147,512
Net assets |  |  |  |  |  | $ 218,189

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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=73530397&loc=d3e4845-128472 + Details
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