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Fair Value Disclosures - Schedule of Additional Information about Assets and Liabilities Measured at Fair Value on Recurring Basis Level 3 Inputs (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2011 RMBS [Member] | Sep. 30, 2011 RMBS [Member] | Dec. 31, 2012 Investments-trading [Member] | Dec. 31, 2011 Investments-trading [Member] | Dec. 31, 2012 Investments-trading [Member] RMBS [Member] | Dec. 31, 2011 Investments-trading [Member] RMBS [Member] | Dec. 31, 2012 Investments-trading [Member] Interests in securitizations [Member] | Dec. 31, 2011 Investments-trading [Member] Interests in securitizations [Member] | Dec. 31, 2012 Investments-trading [Member] Equity securities [Member] | Dec. 31, 2011 Investments-trading [Member] Equity securities [Member] | Dec. 31, 2011 Investments-trading [Member] U.S. government agency MBS and CMOs [Member] | Dec. 31, 2011 Investments-trading [Member] CMBS [Member] | Dec. 31, 2011 Investments-trading [Member] Municipal bonds [Member] | Dec. 31, 2011 Investments-trading [Member] Certificates of deposit [Member] | Dec. 31, 2012 Other investments, at fair value [Member] | Dec. 31, 2011 Other investments, at fair value [Member] | Dec. 31, 2012 Other investments, at fair value [Member] Interests in securitizations [Member] | Dec. 31, 2011 Other investments, at fair value [Member] Interests in securitizations [Member] | Dec. 31, 2012 Other investments, at fair value [Member] Equity securities [Member] | Dec. 31, 2011 Other investments, at fair value [Member] Equity securities [Member] | Dec. 31, 2012 Other investments, at fair value [Member] Equity securities [Member] Other securities [Member] | Dec. 31, 2011 Other investments, at fair value [Member] Equity securities [Member] Other securities [Member] | Dec. 31, 2012 Other investments, at fair value [Member] Equity securities [Member] Other Investment Vehicles [Member] | Dec. 31, 2011 Other investments, at fair value [Member] Equity securities [Member] Other Investment Vehicles [Member] | Dec. 31, 2012 Other investments, at fair value [Member] Equity securities [Member] Other Investment Vehicles [Member] EuroDekania [Member] | Dec. 31, 2011 Other investments, at fair value [Member] Equity securities [Member] Other Investment Vehicles [Member] EuroDekania [Member] | Dec. 31, 2012 Other investments, at fair value [Member] Equity securities [Member] Other Investment Vehicles [Member] Star Asia [Member] | Dec. 31, 2011 Other investments, at fair value [Member] Equity securities [Member] Other Investment Vehicles [Member] Star Asia [Member] | Dec. 31, 2012 Other investments, at fair value [Member] Equity securities [Member] Other Investment Vehicles [Member] Tiptree [Member] | Dec. 31, 2011 Other investments, at fair value [Member] Equity securities [Member] Other Investment Vehicles [Member] Tiptree [Member] | Dec. 31, 2012 Other investments, at fair value [Member] Equity securities [Member] Investment Funds [Member] | Dec. 31, 2011 Other investments, at fair value [Member] Equity securities [Member] Investment Funds [Member] | Dec. 31, 2012 Other investments, at fair value [Member] Equity securities [Member] Investment Funds [Member] Star Asia Special Situations Fund [Member] | Dec. 31, 2011 Other investments, at fair value [Member] Equity securities [Member] Investment Funds [Member] Deep Value [Member] | Dec. 31, 2012 Other investments, at fair value [Member] Residential loans [Member] | Dec. 31, 2011 Other investments, at fair value [Member] Residential loans [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Level 3 inputs, Beginning balance |  |  |  | $ 5,188 | $ 73,385 | $ 4,932 |  | $ 221 | $ 4,500 | $ 35 |  | $ 68,885 |  |  |  | $ 42,748 | $ 42,699 | $ 88 | $ 105 | $ 42,393 | $ 42,291 | $ 132 | $ 500 | $ 42,261 | $ 41,763 | $ 2,370 | $ 1,258 | $ 37,358 | $ 38,025 | $ 2,533 | $ 2,480 |  | $ 28 |  | $ 28 | $ 267 | $ 303
Net trading |  |  |  | 39 | 5,567 | 17 | (149) | 126 | 5,614 | (104) | (8) | 575 | (475) | 7 | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal transactions and other income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,694) | (204) | (11) | (17) | (6,683) | (209) | (41) | (290) | (7,304) | 90 | (331) | 579 | (7,274) | (542) | 301 | 53 | 662 | (9) | 662 | (9) |  | 22
Transfers into level 3 | 12,146 |  | 7,814 |  | 12,146 |  | 7,814 |  |  |  |  | 4,332 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers out of Level 3 |  | (2,080) |  | (57) | (2,080) |  | (2,080) |  |  | (57) |  |  |  |  |  | (358) |  |  |  | (91) |  | (91) |  |  |  |  |  |  |  |  |  |  |  |  |  | (267) |
Purchase |  |  |  | 3,158 | 39,159 | 171 | 4,949 | 2,861 | 10,364 | 126 | 70 | 20,805 | 1,233 | 977 | 761 | 1,941 | 920 |  |  | 1,941 | 920 |  | 36 | 100 | 884 | 15 | 533 | 85 | 351 |  |  | 1,841 |  | 1,841 |  |  |
Sales |  |  |  | (8,033) | (122,989) | (5,120) | (5,602) | (2,913) | (20,257) |  | (27) | (94,597) | (758) | (984) | (764) |  | (667) |  |  |  | (609) |  | (114) |  | (476) |  |  |  | (476) |  |  |  | (19) |  | (19) |  | (58)
Level 3 inputs, Ending balance |  |  |  | 295 | 5,188 |  | 4,932 | 295 | 221 |  | 35 |  |  |  |  | 37,637 | 42,748 | 77 | 88 | 37,560 | 42,393 |  | 132 | 35,057 | 42,261 | 2,054 | 2,370 | 30,169 | 37,358 | 2,834 | 2,533 | 2,503 |  | 2,503 |  |  | 267
Change in unrealized gains/(losses) for the period included in earnings |  |  |  | $ 63 | $ 162 |  | $ 16 | $ 63 | $ 111 |  | $ 35 |  |  |  |  | $ (6,653) | $ (195) | $ (11) | $ (17) | $ (6,642) | $ (200) |  | $ (290) | $ (7,304) | $ 90 | $ (331) | $ 579 | $ (7,274) | $ (542) | $ 301 | $ 53 | $ 662 |  | $ 662 |  |  | $ 22

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