EQUITY AND EARNINGS PER SHARE - Summary of Outstanding Options - Period End (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)		12,380,107
Options exercisable (in shares)		5,449,442
Independent Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)		4,000	5,000
Stock Options [Member] | Independent Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recipient		Directors
Date of grant	[1]	Various
Stock options outstanding (in shares)		4,000
Options exercisable (in shares)		4,000
Weighted average exercise price (in dollars per share)	[2]	$ 13.58
Intrinsic value of exercisable options		$ 0.0
Stock Options [Member] | Manager [Member] | 2003 - 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recipient	[3]	Manager
Date of grant	[1],[3]	2003 - 2007
Stock options outstanding (in shares)	[3]	434,000
Options exercisable (in shares)	[3]	434,000
Weighted average exercise price (in dollars per share)	[2],[3]	$ 31.36
Intrinsic value of exercisable options	[3]	$ 0.0
Stock Options [Member] | Manager [Member] | 2011 - 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recipient	[3]	Manager
Date of grant	[1],[3]	2011 - 2012
Stock options outstanding (in shares)	[3]	25,000
Options exercisable (in shares)	[3]	25,000
Weighted average exercise price (in dollars per share)	[2],[3]	$ 7.19
Intrinsic value of exercisable options	[3]	$ 0.1
Stock Options [Member] | Manager [Member] | 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recipient	[3]	Manager
Date of grant	[1],[3]	2013
Stock options outstanding (in shares)	[3]	1,936,068
Options exercisable (in shares)	[3]	1,936,068
Weighted average exercise price (in dollars per share)	[2],[3]	$ 10.98
Intrinsic value of exercisable options	[3]	$ 2.3
Stock Options [Member] | Manager [Member] | 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recipient	[3]	Manager
Date of grant	[1],[3]	2014
Stock options outstanding (in shares)	[3]	1,437,500
Options exercisable (in shares)	[3]	958,333
Weighted average exercise price (in dollars per share)	[2],[3]	$ 12.20
Intrinsic value of exercisable options	[3]	$ 0.0
Stock Options [Member] | Manager [Member] | 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recipient	[3]	Manager
Date of grant	[1],[3]	2015
Stock options outstanding (in shares)	[3]	8,543,539
Options exercisable (in shares)	[3]	2,092,041
Weighted average exercise price (in dollars per share)	[2],[3]	$ 15.46
Intrinsic value of exercisable options	[3]	$ 0.0

[1] Options expire on the tenth anniversary from date of grant.

[2] The exercise prices are subject to adjustment in connection with return of capital dividends.

[3] The Manager assigned certain of its options to Fortress’s employees as follows:Date of Grant Range of Exercise Prices Total UnexercisedInception to Date2004 - 2007 $29.92 to $33.80 88,2802013 $10.24 to $11.48 1,100,4972014 $12.20 258,750Total 1,447,527