EARNINGS PER SHARE - Schedule of Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Denominator:
Weighted average number of shares of Class A common stock outstanding (in shares)	72,871,990	59,596,889
Basic net income (loss) per share of Class A common stock (in dollars per share)	$ 0.18	$ (0.09)
Denominator:
Weighted average number of shares of Class A common stock outstanding (in shares)	72,871,990	59,596,889
Diluted weighted average number of shares of Class A common stock outstanding (in shares)	109,334,847	59,596,889
Diluted net income per share of Class A common stock (in dollars per share)	$ 0.18	$ (0.09)
Class A common stock
Numerator:
Net income (loss) attributable to Class A common shareholders	$ 13,470	$ (5,539)
Denominator:
Weighted average number of shares of Class A common stock outstanding (in shares)	72,871,990	59,596,889
Basic net income (loss) per share of Class A common stock (in dollars per share)	$ 0.18	$ (0.09)
Numerator:
Net income (loss) attributable to Class A common shareholders	$ 13,470	$ (5,539)
Amounts attributable to operating partnership’s share of Ladder Capital Corp net income (loss)	5,838	0
Additional corporate tax (expense) benefit	(28)	0
Diluted Net income (loss) available for Class A common shareholders	$ 19,280	$ (5,539)
Denominator:
Weighted average number of shares of Class A common stock outstanding (in shares)	72,871,990	59,596,889
Shares issuable relating to converted Class B common shareholders (in shares)	36,340,717	0
Incremental shares of unvested Class A restricted stock (in shares)	122,140	0
Diluted weighted average number of shares of Class A common stock outstanding (in shares)	109,334,847	59,596,889
Diluted net income per share of Class A common stock (in dollars per share)	$ 0.18	$ (0.09)