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Employee Compensation and Benefit Plans - Narrative (Details) - USD ($)
12 Months Ended
Sep. 10, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]        
Percentage of employee contributions   50.00%    
Provident fund contribution percentage on portion of employees salary   12.00%    
Contributions   $ 5,100,000 $ 5,200,000 $ 5,900,000
Future expected benefit payments   2,900,000    
Compensation expense recognized   $ 23,600,000 25,700,000 16,600,000
Common stock remaining available for future issuance (in shares)   494,585    
Contractual term of all options granted (years)   10 years    
Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Employer match limit, percent of employee compensation   6.00%    
Matching compensation per pay period (usd per pay period)   $ 8,700    
Stock Options        
Defined Benefit Plan Disclosure [Line Items]        
Unrecognized compensation costs related to non-vested stock options   $ 2,900    
Weighted average remaining requisite service period   2 months 1 day    
Restricted Stock Units        
Defined Benefit Plan Disclosure [Line Items]        
Weighted average remaining requisite service period   2 years 7 days    
Unvested awards, cost not yet recognized   $ 6,500,000    
Liability Awards        
Defined Benefit Plan Disclosure [Line Items]        
Weighted average remaining requisite service period   1 year    
Unvested awards, cost not yet recognized   $ 15,500,000    
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost   (900,000) (200,000) (2,000,000.0)
Future expected benefit payments   2,900,000    
Future expected benefit payments   2,800,000    
Future expected benefit payments   3,000,000    
Future expected benefit payments   15,600,000    
Contributions to defined benefit pension plans   1,000,000 2,100,000 800,000
Fair value of plan assets   50,078,000 46,303,000  
Benefit obligation   54,262,000 58,965,000  
Unfunded status recognized in Other liabilities   (4,183,000) (12,662,000)  
Gratuity Plan        
Defined Benefit Plan Disclosure [Line Items]        
Future expected benefit payments   1,100,000    
Future expected benefit payments   1,000,000    
Future expected benefit payments   900,000    
Future expected benefit payments   800,000    
Future expected benefit payments   700,000    
Future expected benefit payments   2,200,000    
Fair value of plan assets   42,000 40,000  
Benefit obligation   6,305,000 6,091,000  
Unfunded status recognized in Other liabilities   (6,263,000) (6,051,000)  
Plan assets, benefits paid   $ 800,000 $ 800,000 $ 900,000
PHH Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Benefit obligation discount rate   2.75% 2.25%  
Benefit obligation, period increase (decrease)   $ 3,200,000    
Berkeley Plan        
Defined Benefit Plan Disclosure [Line Items]        
Benefit obligation discount rate   2.80% 2.59%  
Long-Term Incentive (LTI) Program        
Defined Benefit Plan Disclosure [Line Items]        
Granted (in shares)   233,056 601,787 251,076
Grants in period, performance-based (percentage)   50.00% 50.00% 74.00%
Grants in period, time-based (percentage)   50.00% 26.00%  
Long-Term Incentive (LTI) Program | Performance-Based Awards        
Defined Benefit Plan Disclosure [Line Items]        
Vesting percentage of awards (percentage)   100.00%    
Chief Executive Officer        
Defined Benefit Plan Disclosure [Line Items]        
Granted (in shares)   115,173 150,000 75,377
Chief Executive Officer | Long-Term Incentive (LTI) Program | Cash-Settled Awards        
Defined Benefit Plan Disclosure [Line Items]        
Granted (in shares)   232,620 543,896 251,076
Chief Executive Officer | Long-Term Incentive (LTI) Program | Equity-Settled Awards        
Defined Benefit Plan Disclosure [Line Items]        
Granted (in shares) 57,891 115,173 150,000 75,377
Chief Executive Officer | Long-Term Incentive (LTI) Program | Liability Awards        
Defined Benefit Plan Disclosure [Line Items]        
Granted (in shares)   465,026 693,896 326,453
Chief Executive Officer | Long-Term Incentive (LTI) Program | Hybrid Awards        
Defined Benefit Plan Disclosure [Line Items]        
Granted (in shares)   117,233