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STOCK BASED AND OTHER COMPENSATION PLANS - Additional Information (Details) $ / shares in Millions																				3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 01, 2019 USD ($) shares	Jun. 04, 2019 USD ($) installment shares	Feb. 18, 2019	Feb. 18, 2019	Feb. 18, 2019 $ / shares	Feb. 18, 2019 USD ($)	Feb. 18, 2019 shares	Feb. 18, 2019 installment	Jan. 24, 2019 USD ($) shares	Jul. 19, 2018 USD ($) installment shares	Apr. 23, 2018 USD ($) installment anniversary shares	Feb. 18, 2018 USD ($) shares	Dec. 21, 2017 USD ($) installment shares	Jun. 22, 2017 USD ($) installment anniversary shares	Jun. 19, 2017 USD ($) shares	Mar. 03, 2017 USD ($) installment anniversary shares	Feb. 18, 2017 USD ($) installment anniversary shares	Jan. 24, 2017 USD ($) shares	Mar. 17, 2015	Sep. 30, 2019 USD ($) shares	Sep. 30, 2018 USD ($) shares	Sep. 30, 2019 USD ($) shares	Sep. 30, 2018 USD ($) shares	Dec. 31, 2018 USD ($) shares	Jan. 05, 2018 USD ($)	Dec. 29, 2017 USD ($)	Dec. 19, 2017 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost \| $																				$ 14,800,000	$ 8,000,000.0	$ 14,800,000	$ 8,000,000.0
Period of recognition for unrecognized compensation costs																						34 months	34 months
Remaining vesting period																						25 months 24 days	21 months 6 days
Aggregate value of awards granted \| $						$ 11,700,000
Accrued bonuses \| $																								$ 61,400,000			$ 49,300,000
Equity based compensation \| $													$ 15,500,000											$ 26,600,000
Bonuses paid \| $																									$ 16,800,000	$ 17,100,000
Bonus expense \| $																				$ 3,575,000	2,162,000	$ 18,336,000	$ 6,667,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted (in shares)																						1,580,807	33,656
2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of recognition for unrecognized compensation costs			3 years										3 years				3 years
2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock \| Performance-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum performance target percentage																	8.00%
Performance period																	3 years
2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock \| Time Based Vesting on Three Year Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of installments in which awards are vested				3				3					3				3
Number of anniversaries in which awards are vested \| anniversary																	3
2014 Omnibus Incentive Plan \| Non-Management Grantee \| Restricted Stock \| Time Based Vesting on Three Year Anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of installments in which awards are vested \| installment													3
2014 Omnibus Incentive Plan \| Michael Mazzei \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of recognition for unrecognized compensation costs														3 years
2014 Omnibus Incentive Plan \| Harris \| Restricted Stock \| Time-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period													3 years
2014 Deferred Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Days following the end of the participant’s employment																			60 days
Units outstanding (in shares)																				260,200		260,200		380,662
Units unvested (in shares)																				138,583		138,583		130,389
Total employee's contribution, net of forfeitures and payouts related to terminations \| $																				$ 4,600,000		$ 4,600,000
Phantom Units 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total employee's contribution, net of forfeitures and payouts related to terminations \| $																								$ 5,900,000
Bonus Payments
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Bonus expense \| $																				$ 6,500,000	$ 9,200,000	$ 21,000,000.0	$ 26,800,000
Class A Common Stock \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of recognition for unrecognized compensation costs										3 years
Number of restricted shares granted (in shares)										4,720	3,566	25,370								23,443	4,720	1,569,694	33,656
Number of installments in which awards are vested \| installment								3		3	3
Number of anniversaries in which awards are vested		3								3	3
Grant date fair value \| $										$ 100,000	$ 100,000	$ 400,000
Class A Common Stock \| Management Grantees \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted (in shares)		4,568							682
Grant date fair value \| $									$ 11,328
Class A Common Stock \| Board of Directors \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted (in shares)							25,626
Number of anniversaries in which awards are vested		3
Vesting period			1 year									1 year
Grant date fair value \| $		$ 100,000				$ 400,000
Class A Common Stock \| Non-Management Grantee \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted shares granted (in shares)	24,125						849,087
Vesting percentage	50.00%			50.00%
Number of installments in which awards are vested	3			3
Aggregate value of restricted stock awards (in dollars per share) \| $ / shares					$ 14.9
Grant date fair value \| $	$ 400,000
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted \| $																$ 100,000
Number of restricted shares granted (in shares)																5,130
Number of installments in which awards are vested \| installment																3
Number of anniversaries in which awards are vested \| anniversary																3
Vesting period																3 years
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Restricted Stock \| Period 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares)															1,775
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Restricted Stock \| Period 3
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares)															1,775
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Restricted Stock \| Period 4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares)															1,775
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Restricted Stock \| Period 5
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares)															1,775
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Restricted Stock \| Period 6
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares)															1,775
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Restricted Stock \| Period 7
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares)															1,775
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted \| $													$ 10,500,000				$ 10,200,000	$ 30,455
Number of restricted shares granted (in shares)							666,288						768,205				736,461	2,191
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock \| Time-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage													50.00%				50.00%
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock \| Performance-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				50.00%									50.00%				50.00%
Number of installments in which awards are vested \| installment													3				3
Number of anniversaries in which awards are vested \| anniversary																	3
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Management Grantees \| Restricted Stock With Dividend Equivalent Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted \| $																	$ 48,475
Number of restricted shares granted (in shares)																	3,500
Cash dividends received \| $																	$ 1,000,000.0
Class A Common Stock \| 2014 Omnibus Incentive Plan \| New Employee \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted \| $																	$ 400,000
Number of restricted shares granted (in shares)																	28,881
Number of installments in which awards are vested \| installment																	2
Number of anniversaries in which awards are vested \| installment																	2
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Board of Directors \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted \| $																	$ 200,000
Number of restricted shares granted (in shares)																	16,245
Vesting period																	1 year
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Non-Management Grantee \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted \| $													$ 5,000,000.0		$ 300,000		$ 600,000
Number of restricted shares granted (in shares)													369,328		21,307		40,000
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Non-Management Grantee \| Restricted Stock \| Time-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage													50.00%
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Non-Management Grantee \| Restricted Stock \| Performance-based vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage													50.00%
Number of installments in which awards are vested \| installment													3
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Non-Management Grantee \| Restricted Stock \| Period 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares)															1,775
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Non-Management Grantee \| Restricted Stock \| Period 8
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected to vest (in shares)															1,780
Class A Common Stock \| 2014 Omnibus Incentive Plan \| Michael Mazzei \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate value of awards granted \| $														$ 100,000
Number of restricted shares granted (in shares)														5,346
Number of installments in which awards are vested \| installment														3
Number of anniversaries in which awards are vested \| anniversary														3
Class A Common Stock \| 2014 Deferred Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Mandatory contribution period																			3 years