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Fair Value Disclosures - Quantitative Information about Significant Unobservable Inputs used in Level 3 Fair Value Measurements (Detail) (USD $)
 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
May 31, 2013
Derivatives [Member]
Loan commitments [Member]
Minimum [Member]
May 31, 2013
Derivatives [Member]
Loan commitments [Member]
Maximum [Member]
May 31, 2013
Corporate equity securities [Member]
Non-exchange traded securities [Member]
Minimum [Member]
May 31, 2013
Corporate equity securities [Member]
Non-exchange traded securities [Member]
Maximum [Member]
May 31, 2013
Corporate debt securities [Member]
Minimum [Member]
May 31, 2013
Corporate debt securities [Member]
Maximum [Member]
May 31, 2013
Collateralized debt obligations [Member]
May 31, 2013
Collateralized debt obligations [Member]
Range One [Member]
May 31, 2013
Collateralized debt obligations [Member]
Range Two [Member]
May 31, 2013
Collateralized debt obligations [Member]
Range Three [Member]
May 31, 2013
Residential mortgage-backed securities [Member]
Range One [Member]
May 31, 2013
Residential mortgage-backed securities [Member]
Range Two [Member]
May 31, 2013
Residential mortgage-backed securities [Member]
Range Three [Member]
May 31, 2013
Residential mortgage-backed securities [Member]
Range Four [Member]
May 31, 2013
Commercial mortgage-backed securities [Member]
Range Two [Member]
May 31, 2013
Commercial mortgage-backed securities [Member]
Range Three [Member]
May 31, 2013
Loans and other receivables [Member]
Range Four [Member]
May 31, 2013
Loans and other receivables [Member]
Range Six [Member]
May 31, 2013
Loans and other receivables [Member]
Minimum [Member]
May 31, 2013
Loans and other receivables [Member]
Maximum [Member]
May 31, 2013
Successor [Member]
Loans [Member]
Feb. 28, 2013
Successor [Member]
Loans [Member]
May 31, 2013
Successor [Member]
Minimum [Member]
Loans [Member]
May 31, 2013
Successor [Member]
Maximum [Member]
Loans [Member]
May 31, 2013
Successor [Member]
Derivatives [Member]
May 31, 2013
Successor [Member]
Derivatives [Member]
Equity options [Member]
May 31, 2013
Successor [Member]
Derivatives [Member]
Loan commitments [Member]
May 31, 2013
Successor [Member]
Derivatives [Member]
Loan commitments [Member]
Range One [Member]
May 31, 2013
Successor [Member]
Derivatives [Member]
Loan commitments [Member]
Minimum [Member]
May 31, 2013
Successor [Member]
Derivatives [Member]
Loan commitments [Member]
Maximum [Member]
May 31, 2013
Successor [Member]
Corporate equity securities [Member]
May 31, 2013
Successor [Member]
Corporate equity securities [Member]
Non-exchange traded securities [Member]
Range One [Member]
May 31, 2013
Successor [Member]
Corporate equity securities [Member]
Non-exchange traded securities [Member]
Range Two [Member]
May 31, 2013
Successor [Member]
Corporate equity securities [Member]
Warrants [Member]
Range One [Member]
May 31, 2013
Successor [Member]
Corporate debt securities [Member]
May 31, 2013
Successor [Member]
Corporate debt securities [Member]
Range One [Member]
May 31, 2013
Successor [Member]
Corporate debt securities [Member]
Range Two [Member]
May 31, 2013
Successor [Member]
Corporate debt securities [Member]
Range Three [Member]
May 31, 2013
Successor [Member]
Collateralized debt obligations [Member]
May 31, 2013
Successor [Member]
Collateralized debt obligations [Member]
Range One [Member]
May 31, 2013
Successor [Member]
Collateralized debt obligations [Member]
Range Two [Member]
May 31, 2013
Successor [Member]
Collateralized debt obligations [Member]
Range Three [Member]
May 31, 2013
Successor [Member]
Residential mortgage-backed securities [Member]
May 31, 2013
Successor [Member]
Residential mortgage-backed securities [Member]
Range One [Member]
May 31, 2013
Successor [Member]
Residential mortgage-backed securities [Member]
Range Two [Member]
May 31, 2013
Successor [Member]
Residential mortgage-backed securities [Member]
Range Three [Member]
May 31, 2013
Successor [Member]
Residential mortgage-backed securities [Member]
Range Four [Member]
May 31, 2013
Successor [Member]
Commercial mortgage-backed securities [Member]
May 31, 2013
Successor [Member]
Commercial mortgage-backed securities [Member]
Range One [Member]
May 31, 2013
Successor [Member]
Commercial mortgage-backed securities [Member]
Range Two [Member]
May 31, 2013
Successor [Member]
Commercial mortgage-backed securities [Member]
Range Three [Member]
May 31, 2013
Successor [Member]
Other asset-backed securities [Member]
May 31, 2013
Successor [Member]
Other asset-backed securities [Member]
Range One [Member]
May 31, 2013
Successor [Member]
Other asset-backed securities [Member]
Range Two [Member]
May 31, 2013
Successor [Member]
Loans and other receivables [Member]
May 31, 2013
Successor [Member]
Loans and other receivables [Member]
Range One [Member]
May 31, 2013
Successor [Member]
Loans and other receivables [Member]
Range Two [Member]
May 31, 2013
Successor [Member]
Loans and other receivables [Member]
Range Three [Member]
May 31, 2013
Successor [Member]
Loans and other receivables [Member]
Range Four [Member]
May 31, 2013
Successor [Member]
Loans and other receivables [Member]
Range Five [Member]
May 31, 2013
Successor [Member]
Loans and other receivables [Member]
Range Six [Member]
May 31, 2013
Successor [Member]
Investments, at fair value [Member]
Range One [Member]
May 31, 2013
Successor [Member]
Investments, at fair value [Member]
Private equity securities [Member]
May 31, 2013
Successor [Member]
Investments, at fair value [Member]
Private equity securities [Member]
Range One [Member]
Feb. 28, 2013
Predecessor [Member]
Loans [Member]
Nov. 30, 2012
Predecessor [Member]
Loans [Member]
May 31, 2012
Predecessor [Member]
Loans [Member]
Nov. 30, 2011
Predecessor [Member]
Loans [Member]
Nov. 30, 2012
Predecessor [Member]
Derivatives [Member]
Nov. 30, 2012
Predecessor [Member]
Derivatives [Member]
Equity options [Member]
Nov. 30, 2012
Predecessor [Member]
Derivatives [Member]
Loan commitments [Member]
Nov. 30, 2012
Predecessor [Member]
Corporate equity securities [Member]
Nov. 30, 2012
Predecessor [Member]
Corporate equity securities [Member]
Non-exchange traded securities [Member]
Range One [Member]
Nov. 30, 2012
Predecessor [Member]
Corporate equity securities [Member]
Non-exchange traded securities [Member]
Range Two [Member]
Nov. 30, 2012
Predecessor [Member]
Corporate equity securities [Member]
Non-exchange traded securities [Member]
Minimum [Member]
Nov. 30, 2012
Predecessor [Member]
Corporate equity securities [Member]
Non-exchange traded securities [Member]
Maximum [Member]
Nov. 30, 2012
Predecessor [Member]
Corporate equity securities [Member]
Warrants [Member]
Range One [Member]
Nov. 30, 2012
Predecessor [Member]
Collateralized debt obligations [Member]
Nov. 30, 2012
Predecessor [Member]
Collateralized debt obligations [Member]
Range One [Member]
Nov. 30, 2012
Predecessor [Member]
Collateralized debt obligations [Member]
Range Two [Member]
Nov. 30, 2012
Predecessor [Member]
Collateralized debt obligations [Member]
Range Three [Member]
Nov. 30, 2012
Predecessor [Member]
Residential mortgage-backed securities [Member]
Nov. 30, 2012
Predecessor [Member]
Residential mortgage-backed securities [Member]
Range One [Member]
Nov. 30, 2012
Predecessor [Member]
Residential mortgage-backed securities [Member]
Range Two [Member]
Nov. 30, 2012
Predecessor [Member]
Residential mortgage-backed securities [Member]
Range Three [Member]
Nov. 30, 2012
Predecessor [Member]
Residential mortgage-backed securities [Member]
Range Four [Member]
Nov. 30, 2012
Predecessor [Member]
Commercial mortgage-backed securities [Member]
Nov. 30, 2012
Predecessor [Member]
Commercial mortgage-backed securities [Member]
Range One [Member]
Nov. 30, 2012
Predecessor [Member]
Commercial mortgage-backed securities [Member]
Range Two [Member]
Nov. 30, 2012
Predecessor [Member]
Loans and other receivables [Member]
Nov. 30, 2012
Predecessor [Member]
Loans and other receivables [Member]
Range One [Member]
Nov. 30, 2012
Predecessor [Member]
Loans and other receivables [Member]
Range Two [Member]
Nov. 30, 2012
Predecessor [Member]
Loans and other receivables [Member]
Range Three [Member]
Nov. 30, 2012
Predecessor [Member]
Loans and other receivables [Member]
Range Four [Member]
Nov. 30, 2012
Predecessor [Member]
Loans and other receivables [Member]
Range Five [Member]
Nov. 30, 2012
Predecessor [Member]
Loans and other receivables [Member]
Range Six [Member]
Nov. 30, 2012
Predecessor [Member]
Loans and other receivables [Member]
Minimum [Member]
Nov. 30, 2012
Predecessor [Member]
Loans and other receivables [Member]
Maximum [Member]
Nov. 30, 2012
Predecessor [Member]
Investments, at fair value [Member]
Private equity securities [Member]
Nov. 30, 2012
Predecessor [Member]
Investments, at fair value [Member]
Private equity securities [Member]
Range One [Member]
Nov. 30, 2012
Predecessor [Member]
Investments, at fair value [Member]
Private equity securities [Member]
Range Two [Member]
Nov. 30, 2012
Predecessor [Member]
Investments, at fair value [Member]
Private equity securities [Member]
Range Three [Member]
Fair Value Assets And Liabilities Measured On Unobservable Inputs [Line Items]                                                                                                                                                                                                            
Valuation Technique                                         Comparable pricing         Option model Comparable pricing                                                                                     Option model Comparable pricing                                                              
Market Value of Financial Instruments Sold, Not Yet Purchased                                         $ (15,212,000) $ (7,398,000)     $ (19,231,000)                                                                               $ (7,398,000) $ (1,711,000)    $ (10,157,000) $ (9,516,000)                                                                  
Significant Unobservable Input(s)                                         Comparable bond or loan price         Volatility Comparable bond or loan price                                                                                     Volatility Comparable bond or loan price                                                              
Weighted Average                                         100.42           100.20 100.61                 66.95                                     100.29                                                                                            
Market Value of Financial Instruments Owned                                                     8,432,000       19,577,000       18,615,000       41,499,000       143,766,000         16,068,000       1,444,000     82,865,000               14,510,000                 16,815,000           26,705,000       156,069,000         30,202,000     153,365,000                 32,751,000      
Valuation Technique                                                       Comparable pricing       Market approach Scenario analysis Option model   Scenario analysis Comparable pricing Market approach Discounted cash flows         Discounted cash flows         Discounted cash flows       Discounted cash flows     Comparable pricing Discounted cash flows   Market approach   Scenario analysis     Comparable pricing                 Market approach Scenario analysis     Option model Discounted cash flows         Discounted cash flows         Discounted cash flows     Comparable pricing Discounted cash flows   Market approach   Scenario analysis       Market approach Comparable pricing Scenario analysis
Significant Unobservable Input(s)                                                       Comparable bond or loan price       EBITDA multiple Estimated recovery percentage Volatility   Estimated recovery percentage Comparable bond or loan price Yield Constant prepayment rate Constant default rate Loss severity Yield   Constant prepayment rate Constant default rate Loss severity Yield   Loss severity Yield Cumulative loss rate   Loss severity Yield   Comparable bond or loan price Yield Cumulative loss rate Yield EBITDA multiple Estimated recovery percentage     Comparable share price                 EBITDA multiple Estimated recovery percentage     Volatility Constant prepayment rate Constant default rate Loss severity Yield   Constant prepayment rate Constant default rate Loss severity Yield   Yield Cumulative loss rate   Comparable bond or loan price Yield Cumulative loss rate Yield EBITDA multiple Estimated recovery percentage       EBITDA multiple Comparable share price Estimated recovery percentage
Estimated recovery percentage                                                                 25.00%     25.00%                                                                           35.00%                                           15.00%           50.00%
Fair Value Assumptions Expected Volatility                                                   37               35                                                                       39             39                                                  
Fair Value Inputs Yield                                                                           14.00%                               7.00%     20.00%                                                                     19.00%                    
Fair Value Inputs Loss Severity                                                                                                 65.00%       30.00%                                                                                                  
Cumulative loss rate                                                                                                                   0.00%                                                                     0.00%                  
Fair Value Inputs, Earnings before Interest, Taxes, Depreciation, and Amortization Multiple     4.0 16.0                                                       7.7                                                       6.5                             4 16.3                                     8.3         6.6    
Fair Value Inputs Comparable Share Price                                                                                                                           400.00                                                                             400.00  
Fair value inputs comparable bond or loan price $ 100.00 $ 101.25     $ 62.50 $ 69.60                         $ 100.00 $ 101.25     $ 100.00 $ 101.25         $ 97.50 $ 101.25                                                                                 $ 101.13                                                   $ 81.88 $ 101.25        
Range, Minimum             0.00% 0.00% 13.00% 10.00% 0.00% 1.00% 25.00% 0.00% 22.00% 2.00% 10.00% 11.00%                                                                                                                       0.00% 0.00% 13.00% 10.00%   0.00% 0.00% 0.00% 1.00%   22.00% 2.00%         5.00%                
Range, Maximum             5.00% 10.00% 100.00% 59.00% 33.00% 50.00% 75.00% 54.00% 98.00% 21.00% 12.00% 50.00%                                                                                                                       5.00% 10.00% 75.00% 35.00%   25.00% 50.00% 80.00% 50.00%   57.00% 20.00%         54.00%                
Weighted Average, percentage                                                                             0.20% 1.00% 35.00% 27.00%   7.00% 7.00% 49.00% 8.00%     41.00% 11.00%               11.00%   35.00%