EQUITY AND EARNINGS PER SHARE - Summary of Outstanding Options (Details)	Sep. 30, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	12,380,109.000
Manager [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	10,928,581
Manager's Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	1,447,528
Independent Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	4,000
Total Affiliates [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	12,380,109
Issued Prior to 2011 [Member] | Manager [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	345,720
Issued Prior to 2011 [Member] | Manager's Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	88,280
Issued Prior to 2011 [Member] | Independent Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	0
Issued Prior to 2011 [Member] | Total Affiliates [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	434,000
Issued in 2011 - 2015 [Member] | Manager [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	10,582,861
Issued in 2011 - 2015 [Member] | Manager's Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	1,359,248
Issued in 2011 - 2015 [Member] | Independent Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	4,000
Issued in 2011 - 2015 [Member] | Total Affiliates [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options (in shares)	11,946,109