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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
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