Related Party Transactions - Narrative (Detail) - USD ($)			3 Months Ended
	Aug. 05, 2015	Nov. 05, 2014	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Aug. 31, 2014	Aug. 07, 2014
Shares repurchased, shares			11,132,226
Shares repurchased, value			$ 102,700,000
Compensation and management fee			$ 36,997,000	$ 38,629,000
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	9,000,000
Shares repurchased, value	$ 126,400,000
Share repurchase agreement expiration period	2015-08
Advisory fees from affiliate			$ 0	10,500,000
Effective date			Aug. 08, 2014
Management fee percentage						1.20%	0.75%
Management Agreement
Compensation and management fee			$ 37,000,000	$ 38,600,000
Management fee payable			$ 12,000,000		$ 12,100,000