Related Party Transactions (Detail) (USD $) Share data in Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business combination loss recognized	$ 18,900,000
Receivable for advisory and service fees, from affiliates		6,839,000	14,077,000
Compensation and management fee		167,366,000	190,702,000	206,251,000
Management Agreement
Basis for management fee		Amount equal to 1/12th of 1.05% of stockholders' equity,
Compensation and management fee		167,400,000
Initial term of management agreement expiration date		Dec. 31, 2014
Subsidiaries | Management Agreement
Compensation expense		49,200,000
Chimera
Investments with affiliate, available-for-sale equity securities - shares		45.0	45.0
Investments with affiliate, available-for-sale equity securities - fair value		139,400,000	117,400,000
Investments with affiliate, available-for-sale equity securities - unrealized gains		600,000	21,500,000
CreXus
Investments with affiliate, available-for-sale equity securities - shares			9.5
Investments with affiliate, available-for-sale equity securities - fair value			116,700,000
Investments with affiliate, available-for-sale equity securities - unrealized gains			8,700,000
Business combination loss recognized	18,900,000
Automatic Renewal | Management Agreement
Renewal term		1 year
Chimera and CreXus
Advisory fees from affiliate		31,100,000	64,500,000
Receivable for advisory and service fees, from affiliates		$ 6,800,000	$ 14,100,000