EARNINGS PER SHARE - Schedule of Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Denominator:
Weighted average number of shares of Class A common stock outstanding (in shares)	95,187,316	72,871,990
Basic net income (loss) per share of Class A common stock (in dollars per share)	$ 0.53	$ 0.18
Denominator:
Weighted average number of shares of Class A common stock outstanding (in shares)	95,187,316	72,871,990
Diluted weighted average number of shares of Class A common stock outstanding (in shares)	95,389,219	109,334,847
Diluted net income per share of Class A common stock (in dollars per share)	$ 0.53	$ 0.18
Class A Common Stock
Numerator:
Net income (loss) attributable to Class A common shareholders	$ 50,875	$ 13,470
Denominator:
Weighted average number of shares of Class A common stock outstanding (in shares)	95,187,316	72,871,990
Basic net income (loss) per share of Class A common stock (in dollars per share)	$ 0.53	$ 0.18
Numerator:
Net income (loss) attributable to Class A common shareholders	$ 50,875	$ 13,470
Amounts attributable to operating partnership’s share of Ladder Capital Corp net income (loss)	0	5,838
Additional corporate tax (expense) benefit	0	(28)
Diluted Net income (loss) available for Class A common shareholders	$ 50,875	$ 19,280
Denominator:
Weighted average number of shares of Class A common stock outstanding (in shares)	95,187,316	72,871,990
Shares issuable relating to converted Class B common shareholders (in shares)	0	36,340,717
Incremental shares of unvested Class A restricted stock (in shares)	201,903	122,140
Diluted weighted average number of shares of Class A common stock outstanding (in shares)	95,389,219	109,334,847
Diluted net income per share of Class A common stock (in dollars per share)	$ 0.53	$ 0.18