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, 2013	Feb. 28, 2013	May 31, 2012	May 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total gains/losses (realized and unrealized)	$ (3,400)	$ (14,500)	$ (5,500)	$ 15,500
Corporate equity securities [Member] | Successor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	13,234
Total gains/losses (realized and unrealized)	2,906
Purchases	5,023
Sales	(2,984)
Settlements
Net transfers into/ (out of) Level 3	1,398
Ending Balance	19,577
Change in unrealized gains/(losses) relating to instruments still held	2,058
Corporate equity securities [Member] | Predecessor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		16,815	30,269	13,489
Total gains/losses (realized and unrealized)		200	(4,392)	(2,705)
Purchases		707	4,240	18,530
Sales		109	(343)	(343)
Settlements
Net transfers into/ (out of) Level 3		(4,597)	(3,985)	(3,182)
Ending Balance		13,234	25,789	25,789
Change in unrealized gains/(losses) relating to instruments still held		172	(4,429)	(2,741)
Corporate debt securities [Member] | Successor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	31,820
Total gains/losses (realized and unrealized)	(2,867)
Purchases	918
Sales	(11,989)
Settlements
Net transfers into/ (out of) Level 3	733
Ending Balance	18,615
Change in unrealized gains/(losses) relating to instruments still held	(2,242)
Corporate debt securities [Member] | Predecessor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		3,631	33,606	48,140
Total gains/losses (realized and unrealized)		7,836	269	675
Purchases		11,510	14,610	15,405
Sales		(1,918)	(34,404)	(50,387)
Settlements				(1,276)
Net transfers into/ (out of) Level 3		10,761	(6,109)	(4,585)
Ending Balance		31,820	7,972	7,972
Change in unrealized gains/(losses) relating to instruments still held		7,833	(280)	(305)
Collateralized debt obligations [Member] | Successor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	29,776
Total gains/losses (realized and unrealized)	6,698
Purchases	17,864
Sales	(6,270)
Settlements
Net transfers into/ (out of) Level 3	(2,944)
Ending Balance	45,124
Change in unrealized gains/(losses) relating to instruments still held	6,148
Collateralized debt obligations [Member] | Predecessor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		31,255	72,576	47,988
Total gains/losses (realized and unrealized)		3,624	(7,064)	(7,500)
Purchases		9,406	70,819	86,833
Sales		(17,374)	(60,538)	(82,125)
Settlements			(617)	(1,286)
Net transfers into/ (out of) Level 3		2,865	8,830	40,096
Ending Balance		29,776	84,006	84,006
Change in unrealized gains/(losses) relating to instruments still held		(1,125)	(2,102)	(3,226)
Residential mortgage-backed securities [Member] | Successor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	169,426
Total gains/losses (realized and unrealized)	(86)
Purchases	57,750
Sales	(71,534)
Settlements	(5,436)
Net transfers into/ (out of) Level 3	(6,354)
Ending Balance	143,766
Change in unrealized gains/(losses) relating to instruments still held	(367)
Residential mortgage-backed securities [Member] | Predecessor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		156,069	128,751	149,965
Total gains/losses (realized and unrealized)		11,906	3,170	(2,416)
Purchases		132,773	34,667	46,408
Sales		(130,143)	(31,723)	(64,726)
Settlements		(6,057)	(10,844)	(17,789)
Net transfers into/ (out of) Level 3		4,878	(466)	12,113
Ending Balance		169,426	123,555	123,555
Change in unrealized gains/(losses) relating to instruments still held		4,511	(2,641)	(7,960)
Commercial mortgage-backed securities [Member] | Successor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	17,794
Total gains/losses (realized and unrealized)	(2,905)
Purchases	1,403
Sales	(2,744)
Settlements	(1,578)
Net transfers into/ (out of) Level 3	4,098
Ending Balance	16,068
Change in unrealized gains/(losses) relating to instruments still held	(3,835)
Commercial mortgage-backed securities [Member] | Predecessor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		30,202	35,792	52,407
Total gains/losses (realized and unrealized)		(995)	(1,346)	(2,972)
Purchases		2,280	3,026	4,860
Sales		(2,866)	(1,179)	(3,716)
Settlements		(1,188)	(855)	(900)
Net transfers into/ (out of) Level 3		(9,639)	5,156	(9,085)
Ending Balance		17,794	40,594	40,594
Change in unrealized gains/(losses) relating to instruments still held		(2,059)	(936)	(2,349)
Other asset-backed securities [Member] | Successor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	1,252
Total gains/losses (realized and unrealized)	(4)
Purchases
Sales
Settlements
Net transfers into/ (out of) Level 3	196
Ending Balance	1,444
Change in unrealized gains/(losses) relating to instruments still held	(4)
Other asset-backed securities [Member] | Predecessor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		1,114	5,389	3,284
Total gains/losses (realized and unrealized)		50	53	18
Purchases		1,627	7,978	8,081
Sales		(1,342)	(10,507)	(8,631)
Settlements		(19)	(51)	(98)
Net transfers into/ (out of) Level 3		(178)	(1,589)	(1,381)
Ending Balance		1,252	1,273	1,273
Change in unrealized gains/(losses) relating to instruments still held		(1)		(5)
Loans and other receivables [Member] | Successor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	170,986
Total gains/losses (realized and unrealized)	(5,049)
Purchases	160,409
Sales	(24,741)
Settlements	(188,268)
Net transfers into/ (out of) Level 3	4,159
Ending Balance	117,496
Change in unrealized gains/(losses) relating to instruments still held	(6,925)
Loans and other receivables [Member] | Predecessor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		180,393	104,449	97,291
Total gains/losses (realized and unrealized)		(8,682)	(3,784)	(3,334)
Purchases		105,650	45,846	82,929
Sales		(29,828)	(10,186)	(30,873)
Settlements		(61,407)	(14,309)	(39,844)
Net transfers into/ (out of) Level 3		(15,140)	(13,342)	2,505
Ending Balance		170,986	108,674	108,674
Change in unrealized gains/(losses) relating to instruments still held		(12,374)	(3,795)	(4,744)
Investments, at fair value [Member] | Successor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	70,067
Total gains/losses (realized and unrealized)	(1,197)
Purchases	5,000
Sales
Settlements	(2,493)
Net transfers into/ (out of) Level 3	4,987
Ending Balance	76,364
Change in unrealized gains/(losses) relating to instruments still held	(1,349)
Investments, at fair value [Member] | Predecessor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		83,897	78,110	78,326
Total gains/losses (realized and unrealized)		961	13,900	15,277
Purchases		952	308	789
Sales		(4,923)	(6)	(6)
Settlements		(9,721)	(476)	(2,550)
Net transfers into/ (out of) Level 3		(1,099)
Ending Balance		70,067	91,836	91,836
Change in unrealized gains/(losses) relating to instruments still held		1,171	13,915	15,293
Investments in managed funds [Member] | Successor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	59,976
Total gains/losses (realized and unrealized)	(927)
Purchases	2,532
Sales
Settlements	(6,562)
Net transfers into/ (out of) Level 3	122
Ending Balance	55,141
Change in unrealized gains/(losses) relating to instruments still held	(926)
Investments in managed funds [Member] | Predecessor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		57,763	73,015	70,740
Total gains/losses (realized and unrealized)		(363)	(6,174)	(12,387)
Purchases		11,068	2,011	10,511
Sales
Settlements		(8,492)	(538)	(550)
Net transfers into/ (out of) Level 3
Ending Balance		59,976	68,314	68,314
Change in unrealized gains/(losses) relating to instruments still held		(363)	(6,169)	(12,384)
Municipal securities [Member] | Predecessor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			1,176	6,904
Total gains/losses (realized and unrealized)			(85)	(156)
Purchases
Sales			(626)	(1,366)
Settlements
Net transfers into/ (out of) Level 3				(4,917)
Ending Balance			465	465
Change in unrealized gains/(losses) relating to instruments still held			(76)	(76)
Sovereign obligations [Member] | Predecessor [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			140	140
Total gains/losses (realized and unrealized)
Purchases
Sales
Settlements
Net transfers into/ (out of) Level 3			(140)	(140)
Ending Balance
Change in unrealized gains/(losses) relating to instruments still held