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Business acquisitions - Right Point Consulting LLC - Narrative (Details) - USD ($)
$ in Thousands
Nov. 12, 2019
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill   $ 1,685,684 $ 1,695,688 $ 1,574,466
Goodwill deductible for tax purposes   277,428 $ 296,046  
Rightpoint Consulting LLC        
Business Acquisition [Line Items]        
Ownership percentage acquired (in percentage) 100.00%      
Purchase consideration $ 270,669      
Payments to acquire businesses, net of cash acquired and payables 268,170      
Cash and cash equivalents 2,499      
Cash consideration to acquired certain assets and assumed certain liabilities 248,470      
Consideration payable $ 22,199 $ 5,166    
Consideration in cash at closing date for limited liability company interests and vested options to selling equity holders (in percentage) 100.00%      
Limited liability company interests and vested options to selling equity holders (in percentage) 25.00%      
Deferred earn-out consideration rolling period to certain selling equity holders 3 years      
Consideration for remaining limited liability company interests and vested options to selling equity holders (in percentage) 75.00%      
Deferred variable earn-out consideration to certain selling equity holders $ 21,500      
Vested options rolling period to certain selling equity holders 3 years      
Acquired intangible assets, weighted average amortization period 5 years      
Goodwill $ 177,181      
Goodwill deductible for tax purposes 91,929      
Acquisition related cost 7,385      
Acquired assets 39,140      
Liabilities assumed 22,295      
Recognized net deferred tax liability 1,643      
Rightpoint Consulting LLC | BCMI        
Business Acquisition [Line Items]        
Goodwill 16,983      
Rightpoint Consulting LLC | CGRLH        
Business Acquisition [Line Items]        
Goodwill 42,993      
Rightpoint Consulting LLC | HMS        
Business Acquisition [Line Items]        
Goodwill 117,205      
Rightpoint Consulting LLC | Customer-related intangible assets        
Business Acquisition [Line Items]        
Acquired intangibles 46,000      
Rightpoint Consulting LLC | Marketing-related intangible assets        
Business Acquisition [Line Items]        
Acquired intangibles $ 29,000