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Related Party Transactions - Schedule of Related Party Transactions (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Related Party Transaction [Line Items] |  |  |
Net trading | $ 69,486 | $ 73,167 | $ 70,809
Income /(loss) from equity method affiliates | 5,052 | 6,232 | 5,884
Related Party Transactions [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Management fee revenue | 203 | 1,392 | 3,520
Net trading | 156 | 557 | 272
Principal transactions and other income, Dividend income and other | 970 | 368 | 90
Principal transactions and other income, Gain/ (Loss) | (6,943) | (357) | 23,460
Income /(loss) from equity method affiliates | 5,052 | 6,232 | 5,884
Shared Services (Paid) / Received |  | 9 | 7
Related Party Transactions [Member] | CBF [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Management fee revenue | 64 | 273 | 261
Related Party Transactions [Member] | TBBK [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Net trading | 156 | 658 |
Related Party Transactions [Member] | Star Asia [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Principal transactions and other income, Dividend income and other |  | 38 |
Principal transactions and other income, Gain/ (Loss) | (7,274) | (542) | 18,126
Related Party Transactions [Member] | Star Asia Manager [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Income /(loss) from equity method affiliates | 1,101 | 1,694 | 834
Related Party Transactions [Member] | Star Asia SPV [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Income /(loss) from equity method affiliates | 1,581 | 702 | 263
Related Party Transactions [Member] | Star Asia Opportunity [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Income /(loss) from equity method affiliates | 544 | 405 |
Related Party Transactions [Member] | Star Asia Opportunity II [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Income /(loss) from equity method affiliates | (382) |  |
Related Party Transactions [Member] | Star Asia Capital Management [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Income /(loss) from equity method affiliates | 504 | 44 |
Related Party Transactions [Member] | Star Asia Special Situations Fund [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Principal transactions and other income, Gain/ (Loss) | 662 |  |
Related Party Transactions [Member] | SAA Manager [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Income /(loss) from equity method affiliates | (8) |  |
Related Party Transactions [Member] | EuroDekania [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Management fee revenue | 139 | 667 | 667
Net trading |  | (101) | 138
Principal transactions and other income, Dividend income and other | 970 | 298 |
Principal transactions and other income, Gain/ (Loss) | (331) | 579 | 525
Related Party Transactions [Member] | Deep Value [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Management fee revenue |  | 452 | 2,538
Principal transactions and other income, Gain/ (Loss) |  | (9) | 4,481
Income /(loss) from equity method affiliates | 1,712 | 4,351 | 6,070
Related Party Transactions [Member] | Brigadier [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Management fee revenue |  |  | 54
Principal transactions and other income, Gain/ (Loss) |  |  | 64
Related Party Transactions [Member] | RAIT [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Net trading |  |  | 134
Principal transactions and other income, Gain/ (Loss) |  |  | 387
Shared Services (Paid) / Received |  |  | (10)
Related Party Transactions [Member] | MFCA [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Principal transactions and other income, Dividend income and other |  | 32 | 90
Principal transactions and other income, Gain/ (Loss) |  | 71 | 100
Shared Services (Paid) / Received |  | 9 | 17
Related Party Transactions [Member] | Duart Fund [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Principal transactions and other income, Gain/ (Loss) |  | (456) | (223)
Related Party Transactions [Member] | Duart Capital [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Income /(loss) from equity method affiliates |  |  | (1,283)
Related Party Transactions [Member] | Duart Capital and Other [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Income /(loss) from equity method affiliates |  | $ (964) |

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