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Income Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Oct. 27, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Line Items]        
Effective income tax rate   (13.40%) 0.00% 0.00%
Statutory federal tax rate   21.00% 21.00% 21.00%
Operating loss carryforwards, expiration year   2028    
Valuation allowance   $ 1,906,000    
Uncertain tax benefits     $ 0 $ 0
Liability for unrecognized tax benefits   2,300,000    
Unrecognized tax benefits if recognized would impact effective tax rate   2,300,000    
Accrued interest and penalties   700,000 $ 700,000  
White Mountains Capital, Inc. of Intermediate Holdco        
Income Tax Disclosure [Line Items]        
Indemnification asset uncertain tax position   $ 1,800,000    
White Mountains Capital, Inc. of Intermediate Holdco | Tax Receivables Agreement        
Income Tax Disclosure [Line Items]        
Percentage of cash savings required to pay up on agreement 85.00% 85.00%    
Percentage of expected benefit from remaining cash savings under the agreement   15.00%    
Insignia and Senior Executives | Tax Receivables Agreement        
Income Tax Disclosure [Line Items]        
Percentage of cash savings required to pay up on agreement 85.00% 85.00%    
Percentage of expected benefit from remaining cash savings under the agreement   15.00%    
State and Local        
Income Tax Disclosure [Line Items]        
Net operating loss carryforwards   $ 13,700,000    
Net operating loss carryforwards subject to expiration   $ 300,000    
Open tax years   2015 2016 2017 2018    
Foreign        
Income Tax Disclosure [Line Items]        
Tax credit carryforward, description   Company had foreign tax credit carryforwards of $1.0 million, which will begin to expire in 2028.    
Tax credit carryforwards   $ 1,000,000    
Tax credit carryforward, expiration year   2028    
Open tax years   2018 2019    
Federal        
Income Tax Disclosure [Line Items]        
Open tax years   2017 2018 2019