INCOME (LOSS) PER SHARE - Schedule of Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator
Net income (loss) - continuing operations	$ (92,254)	$ (5,403)	$ (95,049)	$ (26,272)
Less: Net income (loss) attributable to noncontrolling interests	2,780	2,547	6,873	6,579
Net income (loss) attributable to common stockholders - continuing operations	(95,034)	(7,950)	(101,922)	(32,851)
Income (loss) from discontinued operations, net of tax	0	(1,376)	0	(889)
Net income (loss) attributable to common stockholders	$ (95,034)	$ (9,326)	$ (101,922)	$ (33,740)
Basic And Diluted Net Income (Loss) Per Share, Denominator [Abstract]
Weighted-average common shares outstanding (in shares)	565,284,705	559,762,180	563,502,954	560,978,712
Continuing operations (in usd per share)	$ (0.17)	$ (0.01)	$ (0.18)	$ (0.06)
Discontinued operations (in usd per share)	0.00	(0.01)	0.00	0.00
Basic and diluted net income (loss) per share (in usd per share)	$ (0.17)	$ (0.02)	$ (0.18)	$ (0.06)