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Acquisition and Divestitures - Fair Value of Net Asset Acquired (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 19, 2017 | Mar. 01, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  | $ 1,172
Accounts receivable |  |  |  |  |  |  |  | 120
Prepaid expenses and other assets |  |  |  |  |  |  |  | 1,111
Property, Plant & Equipment |  |  |  |  |  |  |  | 3,779
Goodwill |  |  | $ 237,303 | $ 224,651 | $ 233,605 | $ 236,006 | $ 228,621 | 149,928
Goodwill |  |  |  |  |  |  |  | 42,539
Long term assets |  |  |  |  |  |  |  | 144
Total assets acquired |  |  |  |  |  |  |  | 118,801
Redeemable noncontrolling interest |  |  |  |  |  |  |  | 12,500
Accounts payable and accrued liabilities |  |  |  |  |  |  |  | 2,735
Lease obligation |  |  |  |  |  |  |  | 333
Deferred revenues |  |  |  |  |  |  |  | 965
Contingent consideration |  |  |  |  |  |  |  | 122
Deferred tax liability |  |  |  |  |  |  |  | 2,381
Net assets acquired |  |  |  |  |  |  |  | 99,765
Technology |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | 35,471
Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | 34,465
F-Secure Corporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | 26,454
Total assets acquired |  |  |  |  |  |  |  | 50,000
Accounts payable and accrued liabilities |  |  |  |  |  |  |  | 519
Net assets acquired |  |  |  |  |  |  |  | 49,481
F-Secure Corporation | Technology |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | 3,071
F-Secure Corporation | Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | 20,475
Razorsight Corporation |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  | 1,172
Accounts receivable |  |  |  |  |  |  |  | 120
Prepaid expenses and other assets |  |  |  |  |  |  |  | 1,111
Property, Plant & Equipment |  |  |  |  |  |  |  | 879
Goodwill |  |  |  |  |  |  |  | 6,985
Long term assets |  |  |  |  |  |  |  | 144
Total assets acquired |  |  |  |  |  |  |  | 31,301
Accounts payable and accrued liabilities |  |  |  |  |  |  |  | 2,216
Lease obligation |  |  |  |  |  |  |  | 333
Deferred revenues |  |  |  |  |  |  |  | 965
Contingent consideration |  |  |  |  |  |  |  | 122
Deferred tax liability |  |  |  |  |  |  |  | 2,381
Net assets acquired |  |  |  |  |  |  |  | 25,284
Razorsight Corporation | Technology |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | 9,200
Razorsight Corporation | Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | 11,690
Intralinks Holdings, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash | $ 39,370 |  |  |  |  |  |  |
Accounts receivable | 46,182 |  |  |  |  |  |  |
Prepaid expenses and other assets | $ 9,775 |  |  |  |  |  |  |
Estimated useful life of property and equipment and leasehold improvements | 4 years |  |  |  |  |  |  |
Property, Plant & Equipment | $ 14,075 |  |  |  |  |  |  |
Goodwill | 482,822 |  |  |  |  |  |  |
Intangible assets | 411,577 |  |  |  |  |  |  |
Long term assets | 3,865 |  |  |  |  |  |  |
Total assets acquired | 1,013,466 |  |  |  |  |  |  |
Deferred revenues | 12,449 |  |  |  |  |  |  |
Investment in unconsolidated affiliate | 5,800 |  |  |  |  |  |  |
Accounts payable | 4,853 |  |  |  |  |  |  |
Accrued expenses | 21,421 |  |  |  |  |  |  |
Deferred tax liability | 110,044 |  |  |  |  |  |  |
Deferred revenues, long-term | 1,051 |  |  |  |  |  |  |
Other liabilities, long-term | 4,570 |  |  |  |  |  |  |
Total liabilities | 154,388 |  |  |  |  |  |  |
Net assets acquired | 859,078 |  |  |  |  |  |  |
Intralinks Holdings, Inc. | Trade name |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets | $ 47,800 |  |  |  |  |  |  |
Weighted-average amortization period | 18 years |  |  |  |  |  |  |
Intralinks Holdings, Inc. | Technology |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets | $ 79,400 |  |  |  |  |  |  |
Weighted-average amortization period | 6 years |  |  |  |  |  |  |
Intralinks Holdings, Inc. | Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets | $ 284,100 |  |  |  |  |  |  |
Weighted-average amortization period | 10 years |  |  |  |  |  |  |
Intralinks Holdings, Inc. | Capitalized software costs |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets | $ 277 |  |  |  |  |  |  |
Weighted-average amortization period | 1 year |  |  |  |  |  |  |
Zentry, LLC |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Property, Plant & Equipment |  |  |  |  |  |  |  | 2,900
Goodwill |  |  |  |  |  |  |  | 9,100
Total assets acquired |  |  |  |  |  |  |  | 37,500
Redeemable noncontrolling interest |  |  |  |  |  |  |  | 12,500
Net assets acquired |  |  |  | $ 25,000 |  |  |  | 25,000
Zentry, LLC | Technology |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | 23,200
Zentry, LLC | Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | $ 2,300
Openwave Messaging |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Cash |  | $ 4,110 |  |  |  |  |  |
Prepaid expenses and other assets |  | 3,005 |  |  |  |  |  |
Property, Plant & Equipment |  | 2,882 |  |  |  |  |  |
Goodwill |  | 81,015 |  |  |  |  |  |
Long term assets |  | 1,870 |  |  |  |  |  |
Total assets acquired |  | 154,982 |  |  |  |  |  |
Accounts payable and accrued liabilities |  | 17,622 |  |  |  |  |  |
Deferred revenues |  | 7,331 |  |  |  |  |  |
Long term liabilities |  | 15,491 |  |  |  |  |  |
Net assets acquired |  | 114,538 |  |  |  |  |  |
Openwave Messaging | Trade name |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  | $ 1,000 |  |  |  |  |  |
Weighted-average amortization period |  | 1 year |  |  |  |  |  |
Openwave Messaging | Technology |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  | $ 32,100 |  |  |  |  |  |
Weighted-average amortization period |  | 7 years |  |  |  |  |  |
Openwave Messaging | Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets |  | $ 29,000 |  |  |  |  |  |
Weighted-average amortization period |  | 10 years |  |  |  |  |  |
Minimum | Technology |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Estimated useful life of property and equipment and leasehold improvements |  |  | 1 year |  |  |  |  |
Minimum | Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Estimated useful life of property and equipment and leasehold improvements |  |  | 5 years |  |  |  |  |
Maximum | Technology |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Estimated useful life of property and equipment and leasehold improvements |  |  | 5 years |  |  |  |  |
Maximum | Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Estimated useful life of property and equipment and leasehold improvements |  |  | 7 years |  |  |  |  |

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