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Offsetting of financial liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivative Liability Fair Value Net Abstract    
Derivative Fair Value Of Derivative Liability $ 34,942 $ 42,585
Derivative Liability Fair Value Gross Asset 0 0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 34,942 42,585
Derivative Liability Fair Value Gross Asset Not Offset 1,092 649
Derivative Collateral Right To Reclaim Securities 16,034 30,390
Derivative, Collateral, Right to Reclaim Cash 0 0
Derivative Liability, Fair Value, Amount Offset Against Collateral, Total 17,816 11,546
Securities Borrowed Amount Offset Against Collateral [Abstract]    
Securities Sold Under Agreements To Repurchase Gross 1,779,146 2,016,752
Securities Sold Under Agreements To Repurchase Asset 0 0
Securities Sold Under Agreements To Repurchase Offsetting 1,779,146 2,016,752
Securities Sold Under Agreements To Repurchase Collateral Right To Reclaim Securities 1,778,906 2,015,711
Securities Sold Under Agreements To Repurchase Not Offset 240 1,041
Securities Sold Under Agreements To Repurchase Collateral Right To Reclaim Cash 0 0
Securities Sold Under Agreements To Repurchase Amount Offset Against Collateral 0 0
Offsetting Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned [Abstract]    
Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Gross 1,814,088 2,059,337
Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Asset 0 0
Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned 1,814,088 2,059,337
Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Asset Not Offset 1,332 1,690
Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Collateral Right To Reclaim Securities 1,794,940 2,046,101
Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Collateral Right To Reclaim Cash 0 0
Derivative Liability Securities Sold Under Agreements To Resell Securities Loaned Amount Offset Against Collateral $ 17,816 $ 11,546