STOCKHOLDERS' EQUITY - Exchange offer with respect to Series A through E preferred stock (Detail) (USD $) In Thousands, except Share data, unless otherwise specified			9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Exchange of preferred stock-Series A through E	Dec. 31, 2013 Exchange of preferred stock-Series A through E	Sep. 30, 2014 Series A Preferred Stock [Member]	Sep. 30, 2014 Series A Preferred Stock [Member] Exchange of preferred stock-Series A through E	Dec. 31, 2013 Series A Preferred Stock [Member] Exchange of preferred stock-Series A through E	Sep. 30, 2014 Series B Preferred Stock [Member]	Sep. 30, 2014 Series B Preferred Stock [Member] Exchange of preferred stock-Series A through E	Dec. 31, 2013 Series B Preferred Stock [Member] Exchange of preferred stock-Series A through E	Sep. 30, 2014 Series C Preferred Stock [Member]	Sep. 30, 2014 Series C Preferred Stock [Member] Exchange of preferred stock-Series A through E	Dec. 31, 2013 Series C Preferred Stock [Member] Exchange of preferred stock-Series A through E	Sep. 30, 2014 Series D Preferred Stock [Member]	Sep. 30, 2014 Series D Preferred Stock [Member] Exchange of preferred stock-Series A through E	Dec. 31, 2013 Series D Preferred Stock [Member] Exchange of preferred stock-Series A through E	Sep. 30, 2014 Series E Preferred Stock [Member]	Sep. 30, 2014 Series E Preferred Stock [Member] Exchange of preferred stock-Series A through E	Dec. 31, 2013 Series E Preferred Stock [Member] Exchange of preferred stock-Series A through E
Class Of Stock [Line Items]
Liquidation value per share	$ 25					$ 25			$ 25			$ 25			$ 25			$ 25
Preferred stock, shares outstanding	1,444,146	2,521,872		2,521,872			450,195			475,987			460,611			510,592			624,487
Shares Of Preferred Stock Exchanged			1,077,726			252,809			179,841			210,759			225,070			209,247
Preferred Stock Shares Outstanding Aftter Exchange			1,444,146			197,386			296,146			249,852			285,522			415,240
Preferred Stock Value	$ 36,104	$ 63,047	$ 36,104			$ 4,935			$ 7,404			$ 6,246			$ 7,138			$ 10,381
Conversion Of Stock Shares Issued1			4,597,121			1,081,652			769,379			890,830			961,724			893,536
Preferred stock dividend rate percentage					7.125%			8.35%			7.40%			7.25%			7.00%