Related Party Transactions - Narrative (Detail) - USD ($) shares in Millions, $ in Millions			3 Months Ended		9 Months Ended
	Aug. 05, 2015	Nov. 05, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Aug. 31, 2014
Amendment Agreement
Basis for management fee					Amount equal to 1/12th of 1.05% of stockholders' equity,
Management Agreement, term		2 years
Term of management agreement expiration date		Dec. 31, 2016
Renewal term		2 years
Management agreement, termination, description					At least two-thirds of the Company's independent directors or the holders of a majority of the Company's outstanding shares of common stock elect to terminate the agreement in their sole discretion for any or no reason.
Amendment Agreement | Minimum
Management agreement, required period to terminate from the date of the notice		1 year
Chimera
Shares repurchased, shares	9.0
Shares repurchased, value	$ 126.4
Share repurchase agreement expiration period	2015-08
Advisory fees from affiliate			$ 3.8	$ 8.3	$ 24.8	$ 20.5
Effective date					Aug. 08, 2014
Management fee percentage								75.00%
Receivable for advisory and service fees, from affiliates			$ 4.0		$ 4.0		$ 10.4
Chimera | Maximum
Management fee percentage								120.00%