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Variable Interest Entities - Summary of Changes in Investments 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]        
Balance, Beginning of Period $ 1,765,988 $ 215,246 $ 1,643,465 $ 246,609
Acquisition of VIEs   1,482,057   1,482,057
Elimination of investments attributable to consolidation of VIEs 19,302 (59,764) 15,400 (59,764)
Purchases 538,507 210,721 922,668 437,666
Sale of investments (319,231) (935,739) (506,092) (975,013)
Net realized (losses) gains (2,566) 5,850 (7,008) 1,192
Changes in net unrealized gains (losses) 6,304 (9,377) 4,951 2,215
Transfers out of Level III (444,462) (55,913) (782,135) (346,430)
Transfers into Level III 194,015 144,885 466,608 209,434
Balance, End of Period 1,757,857 997,966 1,757,857 997,966
Changes in net unrealized gains (losses) included in Net (Losses) Gains from Investment Activities of consolidated VIEs related to investments still held at reporting date $ 3,850 $ (2,063) $ (6,916) $ 5,437