Statement of Comprehensive Income (Loss) of FREMF Trust Reflected the Consolidated Statements of Comprehensive Income (Loss) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Net interest income:
Interest income	$ 519,172,000		$ 655,901,000
Interest expense	(129,420,000)		(124,971,000)
Net interest income	389,752,000		530,930,000
Other Income:
Other income	815,299,000		682,902,000
General & Administration cost	50,938,000		47,378,000
Net Income	(476,499,000)		(203,351,000)
FREMF Trust
Net interest income:
Interest income	2,742,000
Interest expense	(1,606,000)
Net interest income	1,136,000
Other Income:
Unrealized gain(loss) on financial instruments at fair value	3,000	[1]
Transaction & Acquistion costs	810,000
Other income	813,000
General & Administration cost	96,000
Net Income	$ 227,000

[1] Included in Other income (loss).