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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 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Level 3 [Member]
Operating Companies [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Common Stock [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Restricted Stock [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Restricted Stock [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Restricted Stock [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Restricted Stock [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Warrants and Rights [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Portfolio Funds [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Portfolio Funds [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Portfolio Funds [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Portfolio Funds [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Real Estate Investments [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Real Estate Investments [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Real Estate Investments [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Real Estate Investments [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Lehman Claim [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Lehman Claim [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Lehman Claim [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Operating Companies [Member]
Lehman Claim [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Portfolio Funds [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Portfolio Funds [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Portfolio Funds [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Portfolio Funds [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Lehman Claim [Member]
Jun. 30, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Lehman Claim [Member]
Jun. 30, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Consolidated Funds [Member]
Lehman Claim [Member]
Jun. 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     $ 4,808                 $ 1,079 $ 490 $ 1,069 $ 334 $ 0 $ 5,000 $ 0 $ 5,000 $ 3,316 $ 2,902 $ 1,534 $ 1,977 $ 19,012 $ 17,660 $ 16,919 $ 17,081 $ 2,579 $ 2,102 $ 2,353 $ 1,882 $ 574 $ 501 $ 553 $ 313 $ 215,815 $ 260,443 $ 213,402 $ 311,242 $ 5,346 $ 7,193 $ 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)                       0 659 0 659 0 0 0 0 25 0 282 65 1,230 2,322 2,851 36,573 0 141 152 237 0 0 0 0 19 0 434 1 0 0 0 0
(Sales)/short buys                       0 (409) (6) (409) 0 0 0 0 0 (48) (65) (48) (285) (2,587) (814) (36,729) (501) 0 (501) (5) 0 0 0 0 (2,138) (28,300) (5,026) (80,924) 0 0 (2,291) 0
Realized gains (losses)                       0 0 6 0 0 0 0 0 0 48 56 48 2 11 7 107 0 0 0 0 0 0 0 0 (1,906) 843 (1,692) 2,376 1,192 0 1,914 0
Unrealized gains (losses)                       (120) 213 (110) 369 0 0 0 0 (497) 632 1,125 1,492 (83) 338 913 712 1 46 75 175 157 0 178 188 (2,283) 6,602 3,313 6,893 0 127 (425) 1,077
Investments at fair value, end of period     4,808                 959 953 959 953 0 5,000 0 5,000 2,844 3,534 2,844 3,534 19,876 17,744 19,876 17,744 2,079 2,289 2,079 2,289 731 501 731 501 209,507 239,588 209,507 239,588 6,538 7,320 6,538 7,320
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]                                                                                      
Securities sold, not yet purchased, at fair value, beginning of period 400,945 334,251   0 401 0 0 0 0 0 0                                                                
Transfers in       0 0 0 0 0 0 0 0                                                                
Transfers out       0 0 0 0 0 0 (1,004) 0                                                                
Purchases/(covers)       0 (826) 0 (978) (4) 0 (306) 0                                                                
(Sales)/short buys       0 417 0 833 9 0 982 0                                                                
Realized gains (losses)       0 (7) 0 145 0 0 (35) 0                                                                
Unrealized gains (losses)       0 15 0 0 (2) 0 366 0                                                                
Securities sold, not yet purchased, at fair value, end of period $ 400,945 $ 334,251   $ 0 $ 0 $ 0 $ 0 $ 3 $ 0 $ 3 $ 0                                                                
[1] Change in consolidated funds (see Note 3b).
[2] The security was listed on an exchange subsequent to a private funding.