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Fair Value Disclosures - Summary of Changes in Fair Value of Financial Assets Classified as Level 3 (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
May 31, 2014
May 31, 2013
Feb. 28, 2013
May 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Total gains/losses (realized and unrealized) $ (14,800) $ (3,400) $ (14,500) $ (31,300)
Corporate equity securities [Member] | Successor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 12,341 13,234   9,884
Total gains/losses (realized and unrealized) (178) 2,906   (1,583)
Purchases 90 5,023   608
Sales (84) (2,984)   (370)
Settlements          
Issuances         
Net transfers into/ (out of) Level 3 4,233 1,398   7,863
Ending Balance 16,402 19,577   16,402
Change in unrealized gains/(losses) relating to instruments still held (178) 2,058   (494)
Corporate equity securities [Member] | Predecessor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     16,815  
Total gains/losses (realized and unrealized)     200  
Purchases     707  
Sales     109  
Net transfers into/ (out of) Level 3     (4,597)  
Ending Balance     13,234  
Change in unrealized gains/(losses) relating to instruments still held     172  
Corporate debt securities [Member] | Successor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 29,315 31,820   25,666
Total gains/losses (realized and unrealized) 5,659 (2,867)   5,116
Purchases 1,937 918   3,835
Sales (5,831) (11,989)   (3,224)
Settlements          
Issuances         
Net transfers into/ (out of) Level 3 568 733   255
Ending Balance 31,648 18,615   31,648
Change in unrealized gains/(losses) relating to instruments still held 7,999 (2,242)   7,420
Corporate debt securities [Member] | Predecessor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     3,631  
Total gains/losses (realized and unrealized)     7,836  
Purchases     11,510  
Sales     (1,918)  
Net transfers into/ (out of) Level 3     10,761  
Ending Balance     31,820  
Change in unrealized gains/(losses) relating to instruments still held     7,833  
Collateralized debt obligations [Member] | Successor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 66,028 29,776   37,216
Total gains/losses (realized and unrealized) 4,706 6,698   14,169
Purchases 19,146 17,864   36,200
Sales (49,636) (6,270)   (55,963)
Settlements (331)       
Issuances         
Net transfers into/ (out of) Level 3 2,400 (2,944)   10,691
Ending Balance 42,313 45,124   42,313
Change in unrealized gains/(losses) relating to instruments still held 238 6,148   5,656
Collateralized debt obligations [Member] | Predecessor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     31,255  
Total gains/losses (realized and unrealized)     3,584  
Purchases     4,406  
Sales     (17,374)  
Net transfers into/ (out of) Level 3     2,865  
Ending Balance     24,736  
Change in unrealized gains/(losses) relating to instruments still held     (1,165)  
Residential mortgage-backed securities [Member] | Successor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 116,992 169,426   105,492
Total gains/losses (realized and unrealized) (791) (86)   (4,114)
Purchases 10,955 57,750   21,893
Sales (24,618) (71,534)   (37,356)
Settlements (459) (5,436)   (529)
Issuances         
Net transfers into/ (out of) Level 3 (30,117) (6,354)   (13,424)
Ending Balance 71,962 143,766   71,962
Change in unrealized gains/(losses) relating to instruments still held (422) (367)   (1,324)
Residential mortgage-backed securities [Member] | Predecessor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     156,069  
Total gains/losses (realized and unrealized)     11,906  
Purchases     132,773  
Sales     (130,143)  
Settlements     (6,057)  
Net transfers into/ (out of) Level 3     4,878  
Ending Balance     169,426  
Change in unrealized gains/(losses) relating to instruments still held     4,511  
Commercial mortgage-backed securities [Member] | Successor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 17,486 17,794   17,568
Total gains/losses (realized and unrealized) (903) (2,905)   (2,191)
Purchases 18,026 1,403   32,449
Sales (21,038) (2,744)   (29,864)
Settlements (1,189) (1,578)   (1,710)
Issuances         
Net transfers into/ (out of) Level 3 11,864 4,098   7,994
Ending Balance 24,246 16,068   24,246
Change in unrealized gains/(losses) relating to instruments still held (1,933) (3,835)   (3,236)
Commercial mortgage-backed securities [Member] | Predecessor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     30,202  
Total gains/losses (realized and unrealized)     (995)  
Purchases     2,280  
Sales     (2,866)  
Settlements     (1,188)  
Net transfers into/ (out of) Level 3     (9,639)  
Ending Balance     17,794  
Change in unrealized gains/(losses) relating to instruments still held     (2,059)  
Other asset-backed securities [Member] | Successor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 2,375 1,252   12,611
Total gains/losses (realized and unrealized) (314) (4)   (537)
Purchases 15,686     17,361
Sales        (5,496)
Settlements (438)     (438)
Issuances         
Net transfers into/ (out of) Level 3 28,135 196   21,943
Ending Balance 45,444 1,444   45,444
Change in unrealized gains/(losses) relating to instruments still held (314) (4)   (569)
Other asset-backed securities [Member] | Predecessor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     1,114  
Total gains/losses (realized and unrealized)     90  
Purchases     1,627  
Sales     (1,342)  
Settlements     (19)  
Net transfers into/ (out of) Level 3     (178)  
Ending Balance     1,292  
Change in unrealized gains/(losses) relating to instruments still held     39  
Loans and other receivables [Member] | Successor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 128,832 170,986   145,890
Total gains/losses (realized and unrealized) 11,933 (5,049)   3,946
Purchases 42,278 160,409   92,579
Sales (48,064) (24,741)   (88,674)
Settlements (21,482) (188,268)   (26,685)
Issuances         
Net transfers into/ (out of) Level 3 25,146 4,159   11,587
Ending Balance 138,643 117,496   138,643
Change in unrealized gains/(losses) relating to instruments still held 11,922 (6,925)   3,382
Loans and other receivables [Member] | Predecessor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     180,393  
Total gains/losses (realized and unrealized)     (8,682)  
Purchases     105,650  
Sales     (29,828)  
Settlements     (61,407)  
Net transfers into/ (out of) Level 3     (15,140)  
Ending Balance     170,986  
Change in unrealized gains/(losses) relating to instruments still held     (12,374)  
Investments at fair value [Member] | Successor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 118,268 70,067   101,242
Total gains/losses (realized and unrealized) 2,872 (1,197)   27,757
Purchases 7,660 5,000   30,160
Sales (4,101)     (33,684)
Settlements    (2,493)     
Issuances         
Net transfers into/ (out of) Level 3 (6,628) 4,987   (7,404)
Ending Balance 118,071 76,364   118,071
Change in unrealized gains/(losses) relating to instruments still held 224 (1,349)   25,110
Investments at fair value [Member] | Predecessor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     83,897  
Total gains/losses (realized and unrealized)     961  
Purchases     5,952  
Sales     (4,923)  
Settlements     (9,721)  
Net transfers into/ (out of) Level 3     (1,099)  
Ending Balance     75,067  
Change in unrealized gains/(losses) relating to instruments still held     1,171  
Investments in managed funds [Member] | Successor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance 59,528 59,976   57,285
Total gains/losses (realized and unrealized) (8,151) (927)   (11,284)
Purchases 11,305 2,532   13,407
Sales          
Settlements    (6,562)     
Issuances         
Net transfers into/ (out of) Level 3 (6,563) 122   (3,289)
Ending Balance 56,119 55,141   56,119
Change in unrealized gains/(losses) relating to instruments still held (8,151) (926)   (11,284)
Investments in managed funds [Member] | Predecessor [Member]
        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     57,763  
Total gains/losses (realized and unrealized)     (363)  
Purchases     11,068  
Settlements     (8,492)  
Ending Balance     59,976  
Change in unrealized gains/(losses) relating to instruments still held     $ (363)