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Intangible Assets and Goodwill - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 18, 2017
Jan. 01, 2017
Oct. 31, 2016
Sep. 22, 2016
Apr. 05, 2005
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Sep. 18, 2018
Dec. 31, 2017
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Goodwill           $ 0 $ 0      
Impairment charge               $ 3,400    
Blue Waters                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Percentage of interests acquired     100.00%              
Consideration transferred     $ 8,000              
Residual assets     300              
Total assets acquired, net     5,750              
Goodwill     2,100              
Agency Relationships                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset           1,700 2,200 1,800   $ 2,300
Trademark                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset           $ 2,400 2,800 2,500   2,900
Trademark | Blue Waters                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset     1,500              
Asset amortization period           5 years        
Insurance Licenses                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset           $ 16,700 16,700 16,700   16,700
Insurance Licenses | Blue Waters                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of trading licenses     50              
Contractual Rights                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset           $ 900 1,300 1,000   1,400
Customer Lists | 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           $ 300 $ 600 400   $ 700
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        
Crop Re                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Equity method investment, ownership percentage 23.20%                  
Digital Re                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Equity method investment, ownership percentage   49.00%                
Goodwill   $ 1,800                
LSML | Insurance Licenses                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset       $ 1,900            
LSML | Contractual 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]                    
Aggregate consideration for sale and purchase agreement         $ 1,600          
Aspen U.K. | Trademark                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset           $ 1,600   1,600    
Aspen U.K. | Insurance Licenses                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Acquired licenses           2,100        
AAIC, Aspen Specialty, AIUK | Insurance Licenses                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset           16,600   $ 16,600    
AAIC | Insurance Licenses                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Acquired licenses           10,000        
Aspen Specialty | Insurance Licenses                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Acquired licenses           $ 4,500        
Disposed of by Sale | AgriLogic                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Sale of goodwill $ (20,600)                  
Disposed of by Sale | AgriLogic | Trademark                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Intangible assets (disposed) (3,100)                  
Disposed of by Sale | AgriLogic | Customer Lists                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Intangible assets (disposed) (21,800)                  
Disposed of by Sale | AgriLogic | Non-compete Agreements                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Intangible assets (disposed) $ (900)                  
Disposed of by Sale | AgriLogic Consulting, LLC | Consulting Relationships                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Sale of interest of consulting business                 60.00%