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Acquisitions (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
company
Dec. 31, 2013
USD ($)
Sep. 30, 2015
Business Acquisition [Line Items]          
Number of businesses acquired | company     3    
Payments to acquire businesses, net of cash acquired   $ 170,604,000 $ 109,928,000 $ 0  
Other payments to acquire businesses, restricted cash   $ 25,625,000 $ 14,363,000 $ 0  
Software Advice          
Business Acquisition [Line Items]          
Percentage of voting interests acquired     100.00%    
Nubera and Capterra          
Business Acquisition [Line Items]          
Percentage of voting interests acquired   100.00%     100.00%
Contingent consideration arrangements, maximum value (up to)   $ 32,000,000      
Contingent consideration arrangements, maximum value, period of expense recognition   3 years      
Cash payment to acquire business   $ 206,900,000      
Payments to acquire businesses, net of cash acquired   196,200,000      
Acquisitions cash place in escrow   30,000,000      
Market-Visio Oy          
Business Acquisition [Line Items]          
Percentage of voting interests acquired     100.00%    
SircleIT Inc.          
Business Acquisition [Line Items]          
Percentage of voting interests acquired     100.00%    
Software Advice, Inc., Market-Visio Oy, and SircleIT Inc.          
Business Acquisition [Line Items]          
Cash payment to acquire business     $ 115,400,000    
Payments to acquire businesses, net of cash acquired     109,900,000    
Acquisitions cash place in escrow     14,400,000    
Other payments to acquire businesses, restricted cash   800,000      
Finite-lived intangible assets and goodwill acquired     110,300,000    
Other assets acquired     5,100,000    
Decrease in contingent liability   $ 9,200,000      
Acquisition and Integration Charges | Software Advice, Inc., Market-Visio Oy, and SircleIT Inc.          
Business Acquisition [Line Items]          
Contingent consideration arrangements, maximum value (up to)     $ 31,900,000    
Scenario, Forecast | Software Advice, Inc., Market-Visio Oy, and SircleIT Inc.          
Business Acquisition [Line Items]          
Other payments to acquire businesses, restricted cash $ 13,600,000        
Decrease in contingent liability $ 22,700,000