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Intangible Assets and Goodwill - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended
Oct. 31, 2016
Sep. 22, 2016
Jan. 19, 2016
Apr. 05, 2005
Mar. 31, 2017
Mar. 31, 2016
Jan. 01, 2017
Dec. 31, 2016
Dec. 31, 2015
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, Acquired During Period         $ 1,800 $ 22,100      
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, Acquired During Period     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, Acquired During Period 2,100                
Aspen U.K.                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Aggregate consideration for sale and purchase agreement       $ 1,600          
Agency Relationships                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Value of the asset     $ 25,000   25,800 24,600   $ 26,200 $ 0
Intangible Assets, Additions         $ 0 25,000      
Asset amortization period         15 years        
Trade Mark                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Value of the asset     4,000   $ 6,400 5,500   6,600 1,600
Intangible Assets, Additions         $ 0 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        
Trade Mark | Aspen U.K.                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Value of the asset         $ 1,600     1,600  
Insurance Licenses                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Value of the asset         16,700 16,600   16,700 16,600
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                
Insurance Licenses | LSML                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Value of the asset   $ 1,900              
Insurance Licenses | Aspen U.K.                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Acquired licenses         2,100        
Insurance Licenses | AAIC, Aspen Specialty, AIUK                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Value of the asset         16,600     16,600  
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        
Consulting Relationships                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Value of the asset     1,000   900 900   900 0
Intangible Assets, Additions         $ 0 1,000      
Asset amortization period         10 years        
Customer Lists                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Value of the asset         $ 1,600 0   1,700 0
Intangible Assets, Additions         $ 0 0      
Asset amortization period   5 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         $ 3,100 2,800   3,300 0
Intangible Assets, Additions     2,900   $ 0 $ 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 $ 1,800   $ 0 $ 0
Intangible Assets, Additions         0 $ 1,800      
Value of Business Acquired | AgriLogic                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Intangible Assets, Additions     $ 1,800            
Digital Re                  
Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]                  
Goodwill, Acquired During Period         $ 1,800        
Percentage of ownership acquired             49.00%