COMMITMENTS AND CONTINGENCIES - Additional Information (Details) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
	Jan. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) city	Dec. 31, 2016 USD ($)
Operating leased assets
Outstanding mortgage loan commitments			$ 572.3	$ 855.3
Average rate (as a percent)			4.14%	4.17%
Administrative and marketing office space
Operating leased assets
Number of cities in which the company leases properties | city			16
Rental expense		$ 10.2	$ 11.7	$ 11.4
Aggregate annualized rent			$ 11.7
Administrative and marketing office space | Minimum
Operating leased assets
Lease period			3 years
Administrative and marketing office space | Maximum
Operating leased assets
Lease period			10 years
Building contiguous to home office
Operating leased assets
Approximate price for which the company may purchase building at the end of lease term			$ 75.0
Base rate			LIBOR
Predecessor | Administrative and marketing office space
Operating leased assets
Rental expense	$ 0.9