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Long-Term Debt - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2013
Minimum [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2013
Maximum [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2013
Call Options on Long-Term Debt [Member]
Dec. 31, 2013
5.1% Junior Surplus Notes, Segregated Account, Due 2020 [Member]
Dec. 31, 2012
5.1% Junior Surplus Notes, Segregated Account, Due 2020 [Member]
Dec. 31, 2013
5.1% Junior Surplus Notes, Segregated Account, Due 2020 [Member]
One State Street, LLC [Member]
Jun. 30, 2012
5.1% Surplus Notes, General Account, Due 2020 [Member]
Dec. 31, 2013
Surplus Notes [Member]
Dec. 31, 2012
Surplus Notes [Member]
Dec. 31, 2013
5.1% Surplus Notes, Segregated Account, Due 2020 [Member]
Dec. 31, 2012
5.1% Surplus Notes, Segregated Account, Due 2020 [Member]
Debt Instrument [Line Items]                                
Aggregate outstanding Segregated Account Surplus Notes                 $ 36,082 $ 28,039 $ 8,043   $ 1,210,821 $ 1,210,821 $ 53,000 $ 53,000
Long-term debt interest rate                 58.30%       53.90%   52.80%  
Maturity period                 Jun. 07, 2020       Jun. 07, 2020   Jun. 07, 2020  
Aggregate par amount of surplus notes subject to repurchase 939,179                              
Total par value of repurchased surplus notes     789,179                          
Aggregate payment to repurchase surplus notes                       188,446        
Additional borrowings of debt               150,000                
Losses (gains) on extinguishment of debt               177,745                
Adjusted interest rate                 19.50%           10.50%  
Unpaid principal amount of outstanding long-term debt 14,251,771 15,684,925                            
Maturity period       2015-02 2013-02 2047-12 2047-12                  
Debt Instrument, Interest Rate, Effective Percentage Rate Range 8.97%     0.50% 0.39% 13.00% 12.63%                  
Notes outstanding par value 0 14,588                            
Interest on secured borrowings 6.65%                              
Securities in Invested assets outstanding par amount 233,484 266,848                            
Securities in Invested assets fair value 240,150 201,329                            
VIE long-term debt, 2014 0                              
VIE long-term debt, 2015 598,455                              
VIE long-term debt, 2016 0                              
VIE long-term debt, 2017 0                              
VIE long-term debt, 2018 $ 173,206