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Notes payable (Parenthetical) (Detail) (USD $)
9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Effective Percentage     16.00%
Debt Instrument Interest U S Treasury Note Rate 2.49%   3.03%
Fixed Rate 027 To 419 Percent Advances Due 2014 To 2021 [Member]
     
Debt Instrument [Line Items]      
Federal Home Loan Bank Advances General Debt Obligations Disclosures Due Date Earliest 2014    
Federal Home Loan Bank Advances General Debt Obligations Disclosures Due Date Last 2021    
Federal Home Loan Bank Advances General Debt Obligations Disclosures Interest Rate Range From 0.27%    
Federal Home Loan Bank Advances General Debt Obligations Disclosures Interest Rate Range To 4.19%    
Fixed Rate 700 Percent Notes Due July 2019 [Member]
     
Debt Instrument [Line Items]      
Debt Instrument Interest Rate Stated Percentage 7.00%    
Notes Payable Maturity Date Range End 2019    
Fixed Rate 747 Percent Term Notes Due 2014 [Member]
     
Debt Instrument [Line Items]      
Debt Instrument Interest Rate Stated Percentage 7.47%    
Notes Payable Maturity Date Range Start 2014    
Floating Rate 300 Percent Term Notes Due in 2014 [Member]
     
Debt Instrument [Line Items]      
Notes Payable, interest rate term paying interest monthly at a floating rate of 3.00% over the 10-year U.S. Treasury note rate    
Notes Payable Maturity Date Range Start 2014    
Notes Payable Maturity Date Range End 2014    
Fixed Rate 6125 To 8327 Percent Junior Subordinated Deferrable Interest Debentures Due 2027 To 2034 [Member]
     
Debt Instrument [Line Items]      
Notes payable, interest rate range minimum 6.125%    
Notes payable, interest rate range maximum 8.327%    
Notes Payable Maturity Date Range Start 2027    
Notes Payable Maturity Date Range End 2034    
Fixed Rate 500 Percent Until December 2013 And 900 Percent Thereafter Junior Subordinated Deferrable Interest Debentures With No Stated Maturity [Member]
     
Debt Instrument [Line Items]      
Notes payable, gross     $ 936,000,000
Notes payable, maturities no stated maturity    
Notes Payable, interest rate term a fixed interest rate of 5.00% until, but excluding December 5, 2013 and 9.00% thereafter    
Debt Instrument Unamortized Discount     404,460,000
Debt Instrument Unamortized Discount And Fee Amount   $ 414,100,000