EQUITY - Common Stock and Public Offering (Details) - $ / shares			3 Months Ended
	Nov. 09, 2018	Aug. 08, 2018	Jun. 30, 2017	Dec. 31, 2018	Nov. 08, 2018	Aug. 07, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Percentage of one warrant per offered unit			33.33%
Warrant exercise price (in USD per share)	$ 11.50
Number of warrant outstanding				12,577,370
Warrant issued during period (in shares)	3,182,140
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares				1,500,000,000
Common stock, par value (in USD per share)				$ 0.0001
Common stock, shares outstanding (in shares)	74,929,305			74,929,305	67,616,277	65,496,277	37,732,112
Class B Common Stock
Class of Stock [Line Items]
Common stock, par value (in USD per share)								$ 0.0001
Common stock, shares outstanding (in shares)	0				0	9,433,028	9,433,028
Class C Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares				1,500,000,000
Common stock, par value (in USD per share)				$ 0.0001
Common stock, shares outstanding (in shares)	250,000,000			250,000,000	0	0	0
IPO
Class of Stock [Line Items]
Number of units sold (in shares)			37,732,112
Offering price (in USD per share)			$ 10.00
Warrant expiration period			5 years
Warrant redemption price			$ 0.01
Period of notice prior to warrant redemption			30 days
Warrant redemption stock price trigger			$ 18.00
Warrant redemption threshold trading period			20 days
Warrant redemption threshold consecutive trading period			30 days
IPO | Class A Common Stock
Class of Stock [Line Items]
Number of common stock per offered unit (in shares)			1
Warrant exercise price (in USD per share)			$ 11.50
Over-Allotment Option
Class of Stock [Line Items]
Number of units sold (in shares)			2,732,112
Private Placement
Class of Stock [Line Items]
Number of warrant outstanding				3,182,141
Warrant issued during period (in shares)			6,364,281
Warrant issued price (in USD per share)			$ 1.50
Number of securities called by each warrant			1
Number of warrants forfeited (in shares)		3,182,140
Private Placement | Class A Common Stock
Class of Stock [Line Items]
Offering price (in USD per share)	$ 10.00
Warrant exercise price (in USD per share)			$ 11.50
Apache
Class of Stock [Line Items]
Number of warrant outstanding				3,182,140