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Fair Value Disclosures - Schedule of Fair Value Measurements of Investments in Certain Entities that Calculate Net Asset Value Per Share (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Other investments, at fair value $ 38,323 $ 42,772
Other Investment Vehicles [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Other investments, at fair value 35,057 42,261
Other Investment Vehicles [Member] | EuroDekania [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Other investments, at fair value 2,054 2,370
Redemption Frequency N/A N/A
Redemption Notice Period N/A N/A
Other Investment Vehicles [Member] | Star Asia [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Other investments, at fair value 30,169 37,358
Redemption Frequency N/A N/A
Redemption Notice Period N/A N/A
Other Investment Vehicles [Member] | Tiptree [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Other investments, at fair value 2,834 2,533
Redemption Frequency N/A N/A
Redemption Notice Period N/A N/A
Investment Funds [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Other investments, at fair value 2,503  
Investment Funds [Member] | Star Asia Special Situations Fund [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Other investments, at fair value 2,503  
Unfunded Commitments 321  
Redemption Frequency N/A  
Redemption Notice Period N/A  
Other Investment Vehicles and Investment Funds [Member]
    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Other investments, at fair value $ 37,560