Related Party Transactions (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Advisory fees from affiliate	$ 13,540	$ 20,766
Receivable for advisory and service fees, from affiliates	9,244		14,077	[1]
Chimera and CreXus
Advisory fees from affiliate	9,300	16,400
Receivable for advisory and service fees, from affiliates	$ 9,200		$ 14,100

[1] Derived from the audited consolidated financial statements at December 31, 2012.