v3.22.1
Segment Information - Reconciliation of Assets from Reportable Segments to Consolidated (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 2,215,972 $ 2,322,610
Diversified Reinsurance    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 126,905 126,116
AmTrust Reinsurance    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 1,686,992 1,810,940
Total assets - reportable segments    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 1,813,897 1,937,056
Total assets - reportable segments | Diversified Reinsurance    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 126,905 126,116
Total assets - reportable segments | AmTrust Reinsurance    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 1,686,992 1,810,940
Corporate assets    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 402,075 385,554
Corporate assets | Diversified Reinsurance    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 0 0
Corporate assets | AmTrust Reinsurance    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 0 $ 0