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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
Jan. 19, 2016
Apr. 05, 2005
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Contingent consideration         $ 14,100          
Consideration Transferred, Other         22,800          
Ceding commission         2,000          
Consideration transferred         69,100          
Software acquired         12,000          
Residual assets         300          
Total assets acquired, net         $ 47,000          
Goodwill             $ 0 $ 1,800    
Impairment charge                 $ 3,400  
AgriLogic                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Percentage of interests acquired         100.00%          
Aggregate consideration for sale and purchase agreement         $ 53,000          
Goodwill         22,100          
Intangible assets, expected tax deductible amount         34,000          
Goodwill, expected tax deductible amount         $ 21,000          
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%              
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         $ 25,000   2,200 25,800 2,300 $ 26,200
Intangible Assets, Additions             $ 0 0    
Asset amortization period             15 years      
Trade Mark                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset         4,000   $ 2,800 6,400 2,900 6,600
Intangible Assets, Additions             $ 0 0    
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      
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
Intangible Assets, Additions             0 0    
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             1,300 1,600 1,400 1,700
Intangible Assets, Additions             0 0    
Consulting Relationships                    
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                    
Value of the asset         1,000   0 900 0 900
Intangible Assets, Additions             $ 0 0    
Asset amortization period             10 years      
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             $ 600 3,100 700 $ 3,300
Intangible Assets, Additions         2,900   $ 0 $ 0    
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]                    
Intangible Assets, Additions         $ 1,800          
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]                    
Goodwill   $ 1,800                
Equity method investment, ownership percentage   49.00%                
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. | Trade Mark                    
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 | Trade Mark                    
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)