STOCKHOLDERS' EQUITY - Exchange offer with respect to Series A through E preferred stock (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Jun. 30, 2015	Dec. 31, 2015
Class Of Stock [Line Items]
Liquidation value per share	$ 25
Preferred stock, shares outstanding	1,444,146		1,444,146
Preferred Stock Value	$ 36,104		$ 36,104
Conversion Of Stock Shares Issued1		852,831
Series A Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock dividend rate percentage	7.125%
Series B Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock dividend rate percentage	8.35%
Series C Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock dividend rate percentage	7.40%
Series D Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock dividend rate percentage	7.25%
Series E Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock dividend rate percentage	7.00%