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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, 2017
Dec. 31, 2016
Jan. 01, 2017
Dec. 31, 2015
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Goodwill, acquired during period           $ 1,800      
Goodwill and intangible asset impairment           (3,400) $ 0    
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 during period       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 during period   2,100              
Trade Mark                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Value of the asset           $ 2,900 6,600   $ 1,600
Intangible Assets acquired (disposed) $ (3,100)           5,500    
Trade Mark | AgriLogic                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Value of the asset       $ 4,000          
Asset amortization period           10 years      
Trade Mark | 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   16,600
Intangible Assets acquired (disposed)           0 100    
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           $ 2,300 26,200   0
Intangible Assets acquired (disposed) (21,800)           28,100    
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           $ 700 3,300   0
Intangible Assets acquired (disposed) $ (900)           3,900    
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                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Value of the asset             0   0
Intangible Assets acquired (disposed)             1,800    
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   0
Asset amortization period           10 years      
Intangible Assets acquired (disposed)           $ 0 1,000    
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           1,400 1,700   $ 0
Intangible Assets acquired (disposed)           0 1,900    
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. | Trade Mark                  
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 during period           0      
Equity method investment, ownership percentage 23.20%                
Digital Re                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Goodwill, acquired during period           $ 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] | Trade Mark                  
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)