Long Term Incentive Plan - Schedule of Restricted Stock Awards Activity (Detail) (FIDAC Employees and Independent Directors [Member], USD $)	57 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 Restricted Stock [Member]	Sep. 30, 2011 Restricted Stock [Member]	Sep. 30, 2012 Restricted Stock [Member]	Sep. 30, 2011 Restricted Stock [Member]
Share-based Goods and Nonemployee Services Transaction [Line Items]
Unvested shares outstanding - beginning of period		695,200	821,600	758,400	884,800
Granted
Vested	(637,000)	(31,383)	(31,374)	(94,202)	(93,074)
Forfeited	(46,000)	(217)	(226)	(598)	(1,726)
Unvested shares outstanding - end of period		663,600	790,000	663,600	790,000
Unvested shares outstanding - beginning of period, weighted average grant date fair value		$ 17.72	$ 17.72	$ 17.72
Granted, weighted average grant date fair value
Vested, weighted average grant date fair value		$ 17.72	$ 17.72	$ 17.72
Forfeited, weighted average grant date fair value		$ 17.72	$ 17.72	$ 17.72
Unvested shares outstanding - end of period, weighted average grant date fair value		$ 17.72	$ 17.72	$ 17.72	$ 17.72