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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