EARNINGS PER SHARE - Schedule of Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		8 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Numerator:
Net income attributable to Class A common shareholders	$ 3,313	$ 14,656		$ 46,698	$ 39,813
Denominator:
Weighted average number of shares of Class A common stock outstanding	52,922,487	49,394,399	49,101,904	51,091,977	49,101,904
Basic net income per share of Class A common stock (in dollars per share)	$ 0.06	$ 0.30		$ 0.91	$ 0.81
Numerator:
Net income attributable to Class A common shareholders	$ 3,313	$ 14,656		$ 46,698	$ 39,813
Denominator:
Weighted average number of shares of Class A common stock outstanding	52,922,487	49,394,399	49,101,904	51,091,977	49,101,904
Add - dilutive effect of:
Diluted weighted average number of shares of Class A common stock outstanding	53,348,858	97,918,235	97,750,385	51,388,851	97,750,385
Diluted net income per share of Class A common stock (in dollars per share)	$ 0.06	$ 0.28		$ 0.91	$ 0.74
Class A common stock
Numerator:
Net income attributable to Class A common shareholders	$ 3,313	$ 14,656	$ 39,813	$ 46,698	$ 39,813
Denominator:
Weighted average number of shares of Class A common stock outstanding	52,922,487	49,394,399	49,101,904	51,091,977
Basic net income per share of Class A common stock (in dollars per share)	$ 0.06	$ 0.30	$ 0.81	$ 0.91
Numerator:
Net income attributable to Class A common shareholders	$ 3,313	$ 14,656	$ 39,813	$ 46,698	$ 39,813
Add (deduct) - dilutive effect of:
Amounts attributable to operating partnership’s share of Ladder Capital Corp net income (loss)	0	22,827	59,086	0
Additional corporate tax (expense) benefit	0	(10,050)	(26,200)	0
Diluted Net income available for Class A common shareholders	$ 3,313	$ 27,433	$ 72,699	$ 46,698
Denominator:
Weighted average number of shares of Class A common stock outstanding	52,922,487	49,394,399	49,101,904	51,091,977
Add - dilutive effect of:
Shares issuable relating to converted Class B common shareholders	0	48,046,807	48,341,572	0
Incremental shares of unvested Class A restricted stock	426,371	477,029	306,909	296,874
Diluted weighted average number of shares of Class A common stock outstanding	53,348,858	97,918,235	97,750,385	51,388,851
Diluted net income per share of Class A common stock (in dollars per share)	$ 0.06	$ 0.28	$ 0.74	$ 0.91