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Fair Value Disclosures - Schedule of Fair value, Assets and Liabilities Measured on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading $ 176,139 $ 124,546
Other investments, Carrying Value 38,323 42,772
Trading securities sold, not yet purchased 44,167 99,613
Other Investment Vehicles [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 35,057 42,261
Other Investment Vehicles [Member] | EuroDekania [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 2,054 2,370
Other Investment Vehicles [Member] | Star Asia [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 30,169 37,358
Other Investment Vehicles [Member] | Tiptree [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 2,834 2,533
Investment Funds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 2,503  
Investment Funds [Member] | Star Asia Special Situations Fund [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 2,503  
Investments-trading [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 176,139 124,546
Investments-trading [Member] | U.S. government agency MBS and CMOs [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 34,592 7,563
Investments-trading [Member] | U.S. government agency debt securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 21,066 14,600
Investments-trading [Member] | RMBS [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 583 7,108
Investments-trading [Member] | CMBS [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 12 1,587
Investments-trading [Member] | U.S. Treasury securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 147 8,524
Investments-trading [Member] | Interests in securitizations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 352 608
Investments-trading [Member] | SBA loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 15,705 9,049
Investments-trading [Member] | Corporate bonds and redeemable preferred stock [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 56,022 65,445
Investments-trading [Member] | Foreign government bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 448 67
Investments-trading [Member] | Municipal bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 37,745 9,225
Investments-trading [Member] | Certificates of deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 8,934 710
Investments-trading [Member] | Equity securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 533 60
Other investments, at fair value [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 38,323 42,772
Other investments, at fair value [Member] | Other Investment Vehicles [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 35,057 42,261
Other investments, at fair value [Member] | Other Investment Vehicles [Member] | EuroDekania [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 2,054 2,370
Other investments, at fair value [Member] | Other Investment Vehicles [Member] | Star Asia [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 30,169 37,358
Other investments, at fair value [Member] | Other Investment Vehicles [Member] | Tiptree [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 2,834 2,533
Other investments, at fair value [Member] | Investment Funds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 2,503  
Other investments, at fair value [Member] | Investment Funds [Member] | Star Asia Special Situations Fund [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 2,503  
Other investments, at fair value [Member] | Other securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 431 156
Other investments, at fair value [Member] | Interests in securitizations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 77 88
Other investments, at fair value [Member] | Equity securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 37,991 42,417
Other investments, at fair value [Member] | Residential loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 255 267
Trading securities sold not yet purchased [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 44,167 99,613
Trading securities sold not yet purchased [Member] | U.S. Treasury securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 19,722 11,755
Trading securities sold not yet purchased [Member] | Corporate bonds and redeemable preferred stock [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 21,976 87,537
Trading securities sold not yet purchased [Member] | Foreign government bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased   158
Trading securities sold not yet purchased [Member] | Municipal bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 128 143
Trading securities sold not yet purchased [Member] | Certificates of deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 2,325 4
Trading securities sold not yet purchased [Member] | Equity securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 3  
Trading securities sold not yet purchased [Member] | U.S. government agency MBS [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 13 16
Quoted Prices in Active Markets (Level 1) [Member] | Investments-trading [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 6,185 9,472
Quoted Prices in Active Markets (Level 1) [Member] | Investments-trading [Member] | U.S. government agency debt securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading   144
Quoted Prices in Active Markets (Level 1) [Member] | Investments-trading [Member] | U.S. Treasury securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 147 8,524
Quoted Prices in Active Markets (Level 1) [Member] | Investments-trading [Member] | Corporate bonds and redeemable preferred stock [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 5,643 779
Quoted Prices in Active Markets (Level 1) [Member] | Investments-trading [Member] | Equity securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 395 25
Quoted Prices in Active Markets (Level 1) [Member] | Other investments, at fair value [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 24 24
Quoted Prices in Active Markets (Level 1) [Member] | Other investments, at fair value [Member] | Other securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 24 24
Quoted Prices in Active Markets (Level 1) [Member] | Other investments, at fair value [Member] | Equity securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 24 24
Quoted Prices in Active Markets (Level 1) [Member] | Trading securities sold not yet purchased [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 19,877 12,839
Quoted Prices in Active Markets (Level 1) [Member] | Trading securities sold not yet purchased [Member] | U.S. Treasury securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 19,722 11,755
Quoted Prices in Active Markets (Level 1) [Member] | Trading securities sold not yet purchased [Member] | Corporate bonds and redeemable preferred stock [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 152 1,084
Quoted Prices in Active Markets (Level 1) [Member] | Trading securities sold not yet purchased [Member] | Equity securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 3  
Significant Other Observable Inputs (Level 2) [Member] | Investments-trading [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 169,659 109,886
Significant Other Observable Inputs (Level 2) [Member] | Investments-trading [Member] | U.S. government agency MBS and CMOs [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 34,592 7,563
Significant Other Observable Inputs (Level 2) [Member] | Investments-trading [Member] | U.S. government agency debt securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 21,066 14,456
Significant Other Observable Inputs (Level 2) [Member] | Investments-trading [Member] | RMBS [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 583 2,176
Significant Other Observable Inputs (Level 2) [Member] | Investments-trading [Member] | CMBS [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 12 1,587
Significant Other Observable Inputs (Level 2) [Member] | Investments-trading [Member] | Interests in securitizations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 57 387
Significant Other Observable Inputs (Level 2) [Member] | Investments-trading [Member] | SBA loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 15,705 9,049
Significant Other Observable Inputs (Level 2) [Member] | Investments-trading [Member] | Corporate bonds and redeemable preferred stock [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 50,379 64,666
Significant Other Observable Inputs (Level 2) [Member] | Investments-trading [Member] | Foreign government bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 448 67
Significant Other Observable Inputs (Level 2) [Member] | Investments-trading [Member] | Municipal bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 37,745 9,225
Significant Other Observable Inputs (Level 2) [Member] | Investments-trading [Member] | Certificates of deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 8,934 710
Significant Other Observable Inputs (Level 2) [Member] | Investments-trading [Member] | Equity securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 138  
Significant Other Observable Inputs (Level 2) [Member] | Other investments, at fair value [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 662  
Significant Other Observable Inputs (Level 2) [Member] | Other investments, at fair value [Member] | Other securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 407  
Significant Other Observable Inputs (Level 2) [Member] | Other investments, at fair value [Member] | Equity securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 407  
Significant Other Observable Inputs (Level 2) [Member] | Other investments, at fair value [Member] | Residential loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 255  
Significant Other Observable Inputs (Level 2) [Member] | Trading securities sold not yet purchased [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 24,290 86,774
Significant Other Observable Inputs (Level 2) [Member] | Trading securities sold not yet purchased [Member] | Corporate bonds and redeemable preferred stock [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 21,824 86,453
Significant Other Observable Inputs (Level 2) [Member] | Trading securities sold not yet purchased [Member] | Foreign government bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased   158
Significant Other Observable Inputs (Level 2) [Member] | Trading securities sold not yet purchased [Member] | Municipal bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 128 143
Significant Other Observable Inputs (Level 2) [Member] | Trading securities sold not yet purchased [Member] | Certificates of deposit [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 2,325 4
Significant Other Observable Inputs (Level 2) [Member] | Trading securities sold not yet purchased [Member] | U.S. government agency MBS [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities sold, not yet purchased 13 16
Significant Unobservable Inputs (Level 3) [Member] | Investments-trading [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 295 5,188
Significant Unobservable Inputs (Level 3) [Member] | Investments-trading [Member] | RMBS [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading   4,932
Significant Unobservable Inputs (Level 3) [Member] | Investments-trading [Member] | Interests in securitizations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading 295 221
Significant Unobservable Inputs (Level 3) [Member] | Investments-trading [Member] | Equity securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total investments-trading   35
Significant Unobservable Inputs (Level 3) [Member] | Other investments, at fair value [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 37,637 42,748
Significant Unobservable Inputs (Level 3) [Member] | Other investments, at fair value [Member] | Other Investment Vehicles [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 35,057 42,261
Significant Unobservable Inputs (Level 3) [Member] | Other investments, at fair value [Member] | Other Investment Vehicles [Member] | EuroDekania [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 2,054 2,370
Significant Unobservable Inputs (Level 3) [Member] | Other investments, at fair value [Member] | Other Investment Vehicles [Member] | Star Asia [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 30,169 37,358
Significant Unobservable Inputs (Level 3) [Member] | Other investments, at fair value [Member] | Other Investment Vehicles [Member] | Tiptree [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 2,834 2,533
Significant Unobservable Inputs (Level 3) [Member] | Other investments, at fair value [Member] | Investment Funds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 2,503  
Significant Unobservable Inputs (Level 3) [Member] | Other investments, at fair value [Member] | Investment Funds [Member] | Star Asia Special Situations Fund [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 2,503  
Significant Unobservable Inputs (Level 3) [Member] | Other investments, at fair value [Member] | Other securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value   132
Significant Unobservable Inputs (Level 3) [Member] | Other investments, at fair value [Member] | Interests in securitizations [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 77 88
Significant Unobservable Inputs (Level 3) [Member] | Other investments, at fair value [Member] | Equity securities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value 37,560 42,393
Significant Unobservable Inputs (Level 3) [Member] | Other investments, at fair value [Member] | Residential loans [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments, Carrying Value   $ 267