BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Changes in Foreign Currency Exchange Rate (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018
Schedule of Foreign Currency [Line Items]
Revenue	$ 318,220	$ 349,343	$ 651,396	$ 716,011
Operating expense	(318,618)	(361,739)	(672,096)	(728,736)
Earnings from unconsolidated affiliates, net of losses	633	1,461	2,980	(86)
Loss before benefit for income taxes	(184,701)	(159,085)	(369,296)	(193,733)
Provision for income taxes	21,782	15,655	37,289	18,506
Net income (loss)	(162,919)	(143,430)	(332,007)	(175,227)
Total stockholders’ investment	481,162	$ 976,076	481,162	$ 976,076	$ 655,842	$ 812,367	$ 1,126,245	$ 1,183,501
Quarter To Date | Impact of Changes in Foreign Currency Exchange Rates
Schedule of Foreign Currency [Line Items]
Revenue	(11,361)
Operating expense	11,025
Earnings from unconsolidated affiliates, net of losses	(576)
Other income (expense), net	(3,509)
Loss before benefit for income taxes	(4,421)
Provision for income taxes	1,041
Net income (loss)	(3,380)
Cumulative translation adjustment	(12,299)
Total stockholders’ investment	(15,679)		(15,679)
Year To Date | Impact of Changes in Foreign Currency Exchange Rates
Schedule of Foreign Currency [Line Items]
Revenue			(23,964)
Operating expense			21,855
Earnings from unconsolidated affiliates, net of losses			1,888
Other income (expense), net			(3,411)
Loss before benefit for income taxes			(3,632)
Provision for income taxes			415
Net income (loss)			(3,217)
Cumulative translation adjustment			4,589
Total stockholders’ investment	$ 1,372		$ 1,372