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Notes payable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Others $ 19,227 $ 19,830
Notes Payable 1,674,511 1,711,828
Fixed Rate Advances Due 2015 To 2029 [Member]    
Debt Instrument [Line Items]    
Federal Home Loan Bank Advances Long Term 765,485 802,198
Fixed Rate 700 Percent Notes Due July 2019 [Member]    
Debt Instrument [Line Items]    
Senior Long Term Notes 450,000 450,000
Fixed Rate Junior Subordinated Deferrable Interest Debentures Due 2027 To 2034 [Member]    
Debt Instrument [Line Items]    
Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust $ 439,799 $ 439,800