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Variable Interest Entities - Net (Losses) Gains from Investment Activities of Consolidated VIEs (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Fair Value Disclosures [Abstract]        
Net unrealized (losses) gains from investment activities $ (138,181) $ (18,021) $ (113,061) $ 51,998
Net realized gains from investment activities 32,988 12,349 83,918 14,634
Net (losses) gains from investment activities (105,193) (5,672) (29,143) 66,632
Net unrealized losses from debt (68,013) (14,247) (156,249) (102,825)
Net realized gains from debt 91,000   83,397  
Net gains (losses) from debt 22,987 (14,247) (72,852) (102,825)
Interest and other income 152,501 171,229 329,626 216,860
Other expenses (105,493) (119,547) (214,968) (165,105)
Net (Losses) Gains from Investment Activities of Consolidated VIEs $ (35,198) $ 31,763 $ 12,663 $ 15,562