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Collateralized Transactions Collateralized Table (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Permitted to Repledge
    
Securities lending transactions $ 6,971,500 $ 5,323,700
Agreements to resell 6,898,800 6,778,800
Customer margin securities 15,559,000 13,603,700
Total collateralized transactions 29,429,300 25,706,200 [1]
Sold or Repledged
    
Securities lending transactions 3,461,300 2,699,200
Agreements to resell 6,898,800 [2] 6,778,800 [2]
Customer margin securities 3,414,300 3,016,300
Total collateralized transactions $ 13,774,400 $ 12,494,300 [1]
[1] The Company has revised its reporting of collateral permitted to be repledged and collateral sold or repledged, primarily with respect to securities available for repledging under securities lending transactions in connection with the Company's Stock Yield Enhancement Program. Disclosures for December 31, 2012 have been conformed to the new presentation for comparability purposes.
[2] At March 31, 2013, $6.5 billion or 94% (at December 31, 2012, $6.4 billion, or 94%), of securities acquired through agreements to resell that are shown as repledged have been deposited in a separate bank account for the exclusive benefit of customers in accordance with SEC Rule 15c3-3.