SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Regions Segments	Sep. 30, 2015 USD ($)	Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segments			1
Number of reportable segments | Regions			4
Total consolidated gross revenue	$ 357,467	$ 446,911	$ 726,865	$ 913,907
Total earnings from unconsolidated affiliates, net of losses - equity method investments	138	(15,360)	3,968	(9,064)
Loss on disposal of assets	(2,186)	(14,007)	(12,203)	(21,702)
Total consolidated operating loss	(26,882)	(29,833)	(53,117)	(24,999)
Total depreciation and amortization	28,592	37,387	63,286	74,533
Total identifiable assets	3,198,096		3,198,096		$ 3,262,945
Total investments in unconsolidated affiliates - equity method	200,197		200,197		188,666
Accelerated depreciation	1,300	10,500	8,200	19,300
Construction in progress within property and equipment	315,600		315,600		307,400
Intersegment eliminations
Segment Reporting Information [Line Items]
Total consolidated gross revenue	3,041	3,070	6,272	7,897
External Customer
Segment Reporting Information [Line Items]
Total consolidated gross revenue	357,467	446,911	726,865	913,907
Europe Caspian
Segment Reporting Information [Line Items]
Total consolidated gross revenue	193,725	226,183	390,688	449,524
Total earnings from unconsolidated affiliates, net of losses - equity method investments	65	153	116	252
Total consolidated operating income (loss)	5,741	15,060	18,771	29,257
Total depreciation and amortization	11,220	10,195	22,409	20,977
Total identifiable assets	1,012,568		1,012,568		1,067,647
Total investments in unconsolidated affiliates - equity method	156		156		298
Accelerated depreciation	200		400
Europe Caspian | Intersegment eliminations
Segment Reporting Information [Line Items]
Total consolidated gross revenue	1,891	685	4,030	1,077
Europe Caspian | External Customer
Segment Reporting Information [Line Items]
Total consolidated gross revenue	191,834	225,498	386,658	448,447
Africa
Segment Reporting Information [Line Items]
Total consolidated gross revenue	51,644	65,301	105,906	144,216
Total consolidated operating income (loss)	7,942	7,574	9,513	20,526
Total depreciation and amortization	3,220	9,809	8,673	15,693
Total identifiable assets	391,821		391,821		304,081
Accelerated depreciation	1,100	6,500	3,900	8,800
Africa | Intersegment eliminations
Segment Reporting Information [Line Items]
Total consolidated gross revenue	0	2	0	2
Africa | External Customer
Segment Reporting Information [Line Items]
Total consolidated gross revenue	51,644	65,299	105,906	144,214
Americas
Segment Reporting Information [Line Items]
Total consolidated gross revenue	57,207	73,578	116,251	153,830
Total earnings from unconsolidated affiliates, net of losses - equity method investments	260	(15,513)	4,123	(9,316)
Total consolidated operating income (loss)	2,643	(9,046)	3,564	7,486
Total depreciation and amortization	7,228	10,570	18,609	20,726
Total identifiable assets	852,090		852,090		884,455
Total investments in unconsolidated affiliates - equity method	196,335		196,335		183,990
Accelerated depreciation		3,200	3,900	6,100
Americas | Intersegment eliminations
Segment Reporting Information [Line Items]
Total consolidated gross revenue	1,115	1,720	1,962	5,372
Americas | External Customer
Segment Reporting Information [Line Items]
Total consolidated gross revenue	56,092	71,858	114,289	148,458
Asia Pacific
Segment Reporting Information [Line Items]
Total consolidated gross revenue	55,256	78,693	114,400	159,081
Total consolidated operating income (loss)	(9,575)	5,013	(15,468)	4,325
Total depreciation and amortization	4,377	4,858	8,613	13,177
Total identifiable assets	402,109		402,109		426,677
Accelerated depreciation		800		4,400
Asia Pacific | Intersegment eliminations
Segment Reporting Information [Line Items]
Total consolidated gross revenue	1	2	1	2
Asia Pacific | External Customer
Segment Reporting Information [Line Items]
Total consolidated gross revenue	55,255	78,691	114,399	159,079
Corporate And Other
Segment Reporting Information [Line Items]
Total consolidated gross revenue	2,676	6,226	5,892	15,153
Total earnings from unconsolidated affiliates, net of losses - equity method investments	(187)	0	(271)	0
Total consolidated operating income (loss)	(31,447)	(34,427)	(57,294)	(64,891)
Total depreciation and amortization	2,547	1,955	4,982	3,960
Total identifiable assets	539,508		539,508		580,085
Total investments in unconsolidated affiliates - equity method	3,706		3,706		$ 4,378
Corporate And Other | Intersegment eliminations
Segment Reporting Information [Line Items]
Total consolidated gross revenue	34	661	279	1,444
Corporate And Other | External Customer
Segment Reporting Information [Line Items]
Total consolidated gross revenue	$ 2,642	$ 5,565	$ 5,613	$ 13,709