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Fair Value Measurements for Operating Entities and Consolidated Funds - Unobservable Input Roll Forward (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Level 3 [Member]
Operating Companies [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Restricted Stock [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Restricted Stock [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Restricted Stock [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Restricted Stock [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Portfolio Funds [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Portfolio Funds [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Portfolio Funds [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Portfolio Funds [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Real Estate Investments [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Real Estate Investments [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Real Estate Investments [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Real Estate Investments [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Lehman Claim [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Lehman Claim [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Lehman Claim [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Lehman Claim [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Portfolio Funds [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Portfolio Funds [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Portfolio Funds [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Portfolio Funds [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Lehman Claim [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Lehman Claim [Member]
Sep. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Lehman Claim [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Lehman Claim [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                                                                                      
Investments at fair value, beginning of period     $ 8,058                 $ 959 $ 953 $ 1,069 $ 334 $ 0 $ 5,000 $ 0 $ 5,000 $ 2,844 $ 3,534 $ 1,534 $ 1,977 $ 19,876 $ 17,744 $ 16,919 $ 17,081 $ 2,079 $ 2,289 $ 2,353 $ 1,882 $ 731 $ 501 $ 553 $ 313 $ 209,507 $ 239,588 $ 213,402 $ 311,242 $ 6,538 $ 7,320 $ 7,340 $ 6,243
Transfers in                       0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 16,227 [1] 0 0 0 0 0
Transfers out                       0 0 0 0 0 0 0 0 0 0 (88) [2] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (17,151) [1] 0 0 0 0 0
Purchases/(covers)                       2,000 19 2,000 678 0 0 0 0 341 40 623 105 320 7,356 3,171 43,929 0 17 152 254 0 0 0 0 0 1 434 2 0 0 0 0
(Sales)/short buys                       0 (135) (6) (544) 0 (4,857) 0 (4,857) 0 (36) (65) (84) (361) (11,648) (1,175) (48,377) 0 (1) (501) (6) 0 0 0 0 (19,233) (16,320) (24,259) (97,244) 0 0 (2,291) 0
Realized gains (losses)                       0 135 6 135 0 (143) 0 (143) 0 0 56 48 (48) 1 (41) 108 0 0 0 0 0 0 0 0 182 68 (1,510) 2,444 0 0 1,914 0
Unrealized gains (losses)                       1 (160) (109) 209 0 0 0 0 877 (2,184) 2,002 (692) 706 456 1,619 1,168 23 2 98 177 30 0 208 188 (2,659) (4,181) 654 2,712 322 (125) (103) 952
Investments at fair value, end of period     8,058                 2,960 812 2,960 812 0 0 0 0 4,062 1,354 4,062 1,354 20,493 13,909 20,493 13,909 2,102 2,307 2,102 2,307 761 501 761 501 187,797 219,156 187,797 219,156 6,860 7,195 6,860 7,195
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                                                                                      
Securities sold, not yet purchased, at fair value, beginning of period 210,705 334,251   0 0 0 0 3 0 0 0                                                                
Transfers in       0 0 0 0 0 0 0 0                                                                
Transfers out       0 0 0 0 0 0 (1,004) [3] 0                                                                
Purchases/(covers)       0 0 0 (978) 0 0 (306) 0                                                                
(Sales)/short buys       0 0 0 833 0 0 982 0                                                                
Realized gains (losses)       0 0 0 145   0 (38) 0                                                                
Unrealized gains (losses)       0 0 0 0 0 0 366 0                                                                
Securities sold, not yet purchased, at fair value, end of period $ 210,705 $ 334,251   $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0                                                                
[1] Change in consolidated funds (see Note 3b).
[2] The security was listed on an exchange subsequent to a private funding.
[3] The security began trading on an exchange due to a business combination.