Derivative Financial Instruments - Unrealized and Realized Gains (Losses) on Derivative Contracts (Detail) (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
	May 31, 2014 Successor [Member]	May 31, 2013 Successor [Member]	May 31, 2014 Successor [Member]	May 31, 2014 Successor [Member] Interest rate contracts [Member]	May 31, 2013 Successor [Member] Interest rate contracts [Member]	May 31, 2014 Successor [Member] Interest rate contracts [Member]	May 31, 2014 Successor [Member] Foreign exchange contracts [Member]	May 31, 2013 Successor [Member] Foreign exchange contracts [Member]	May 31, 2014 Successor [Member] Foreign exchange contracts [Member]	May 31, 2014 Successor [Member] Equity contracts [Member]	May 31, 2013 Successor [Member] Equity contracts [Member]	May 31, 2014 Successor [Member] Equity contracts [Member]	May 31, 2014 Successor [Member] Commodity contracts [Member]	May 31, 2013 Successor [Member] Commodity contracts [Member]	May 31, 2014 Successor [Member] Commodity contracts [Member]	May 31, 2014 Successor [Member] Credit contracts [Member]	May 31, 2013 Successor [Member] Credit contracts [Member]	May 31, 2014 Successor [Member] Credit contracts [Member]	Feb. 28, 2013 Predecessor [Member]	Feb. 28, 2013 Predecessor [Member] Interest rate contracts [Member]	Feb. 28, 2013 Predecessor [Member] Foreign exchange contracts [Member]	Feb. 28, 2013 Predecessor [Member] Equity contracts [Member]	Feb. 28, 2013 Predecessor [Member] Commodity contracts [Member]	Feb. 28, 2013 Predecessor [Member] Credit contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized and realized gains (losses)	$ (117,195)	$ 77,911	$ (190,770)	$ (49,738)	$ 29,381	$ (49,946)	$ (4,281)	$ 4,135	$ 1,156	$ (73,529)	$ 33,892	$ (164,630)	$ 21,794	$ 21,513	$ 37,980	$ (11,441)	$ (11,010)	$ (15,330)	$ 44,653	$ 38,936	$ 11,895	$ (22,021)	$ 19,585	$ (3,742)