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Goodwill and Other Intangible Assets (Details 3) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 04, 2016
Apr. 14, 2015
Mar. 16, 2015
Mar. 31, 2016
Dec. 31, 2016
Goodwill          
Purchase consideration         $ 3,480
Aleutian Consulting Inc          
Goodwill          
Purchase consideration $ 3,500        
3Q Digital Inc          
Goodwill          
Purchase consideration     $ 41,800    
Customer relationships | 3Q Digital Inc          
Goodwill          
Acquisitions     $ 4,800    
Trillium Software | Discontinued operations          
Goodwill          
Disposition       $ (149,300)  
B2B Research Business | Disposition          
Goodwill          
Disposition   $ (11,100)      
B2B Research Business | Disposition | Tradenames and trademarks          
Goodwill          
Intangible assets written off related to sale of business   $ 2,300