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Intangible Assets - Additional Information (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 18, 2017
Oct. 31, 2016
Sep. 22, 2016
Jan. 19, 2016
Apr. 05, 2005
Dec. 31, 2018
Dec. 31, 2017
Sep. 18, 2018
Jan. 01, 2017
Dec. 31, 2016
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Goodwill, acquired             $ 1,800      
Goodwill and intangible asset impairment           $ 0 (3,400)      
AgriLogic                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Percentage of interests acquired       100.00%            
Initial purchase price       $ 53,000            
Business combination, contingent consideration, liability       14,100            
Business combination, contingent consideration, maximum payable       22,800            
Business combination, ceding commission       2,000            
Aggregate consideration for sale and purchase agreement       69,100            
Business combination, office properties and equipments       12,000            
Business combination, residual assets       300            
Business combination, net assets acquired       47,000            
Goodwill, acquired       22,100            
Intangible assets acquired eligible tax deductible amount       34,000            
Goodwill acquired eligible tax deductible amount       $ 21,000            
Business acquisition, eligible tax deduction period       15 years            
Blue Waters                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Percentage of interests acquired   100.00%                
Aggregate consideration for sale and purchase agreement   $ 8,000                
Business combination, residual assets   300                
Business combination, net assets acquired   5,750                
Goodwill, acquired   2,100                
Trademarks                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset           $ 2,500 2,900     $ 6,600
Intangible Assets acquired (disposed) $ 0           (3,100)      
Trademarks | AgriLogic                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset       $ 4,000            
Asset amortization period           10 years        
Trademarks | Blue Waters                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset   1,500                
Asset amortization period           5 years        
Aspen trademark                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset           $ 1,600        
Insurance Licenses                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset           16,700 16,700     16,700
Intangible Assets acquired (disposed)           0 0      
Insurance Licenses | Blue Waters                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Acquired licenses   50                
Insurance Licenses | AAIC, Aspen Specialty, AIUK [Member]                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset           16,600        
Insurance Licenses | Aspen U.K.                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Acquired licenses           2,100        
Insurance Licenses | Aspen Specialty                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Acquired licenses           4,500        
Insurance Licenses | AAIC                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Acquired licenses           10,000        
Agency Relationships                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset           $ 1,800 2,300     26,200
Intangible Assets acquired (disposed) 0           (21,800)      
Agency Relationships | AgriLogic                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset       25,000            
Asset amortization period           15 years        
Agency Relationships | Blue Waters                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset   3,100                
Asset amortization period           5 years        
Non-compete Agreements                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset           $ 400 700     3,300
Intangible Assets acquired (disposed) $ 0           (900)      
Non-compete Agreements | AgriLogic                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Indefinite-lived and finite-lived intangible assets acquired       2,900            
Asset amortization period           5 years        
Non-compete Agreements | Blue Waters                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset   $ 1,000                
Asset amortization period           5 years        
Value of Business Acquired | AgriLogic                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Indefinite-lived and finite-lived intangible assets acquired       1,800            
Consulting Relationships                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset             0     900
Asset amortization period           10 years        
Intangible Assets acquired (disposed)             0      
Consulting Relationships | AgriLogic                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset       $ 1,000            
Renewal Rights                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset           $ 1,000 1,400     $ 1,700
Intangible Assets acquired (disposed)           $ 0 0      
AAIC, Aspen Specialty, AIUK [Member] | Insurance Licenses                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset             16,600      
Liberty Specialty | Insurance Licenses                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset     $ 1,900              
Liberty Specialty | Renewal Rights                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Asset amortization period     5 years              
Aspen U.K.                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Initial purchase price         $ 1,600          
Aspen U.K. | Trademarks                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset             1,600      
Crop Re                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Goodwill, acquired             0      
Equity method investment, ownership percentage 23.20%                  
Digital Re                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Goodwill, acquired             $ 1,800      
Equity method investment, ownership percentage                 49.00%  
AgriLogic | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Goodwill, disposed $ (20,600)                  
AgriLogic | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Trademarks                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Intangible Assets acquired (disposed) (3,100)                  
AgriLogic | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Agency Relationships                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Intangible Assets acquired (disposed) (21,800)                  
AgriLogic | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Non-compete Agreements                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Intangible Assets acquired (disposed) $ (900)                  
AgriLogic Consulting, LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Consulting Relationships                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Sale of interest in consulting business               60.00%