STOCKHOLDERS' EQUITY - Exchange offer with respect to Series A through E preferred stock (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2015	Sep. 30, 2017	Dec. 31, 2016
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%