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SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Country
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2017
USD ($)
Customer
Regions
Country
Segments
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 31, 2014
Segment Reporting Information [Line Items]                        
Number of operating segments | Segments                 1      
Number of reportable segments | Regions                 4      
Revenues $ 336,194 $ 337,443 $ 357,467 $ 369,398 $ 381,719 $ 419,887 $ 446,911 $ 466,996 $ 1,400,502 $ 1,715,513 $ 1,858,669  
Income (loss) from equity method investments                 4,877 (1,807) (3,839)  
Operating income (loss) (19,528) (19,097) (26,882) (26,235) (37,923) 22,077 (29,833) 4,834 (91,742) (40,845) 145,874  
Gain (loss) on disposal of assets (1,400) $ (900) $ (2,200) $ (10,000) (6,800) $ (2,200) $ (14,000) $ (7,700) (14,499) (30,693) (35,849)  
Capital expenditures                 135,110 372,375 601,834  
Total depreciation and amortization                 118,748 136,812 114,293  
Total identifiable assets 3,113,847       3,262,945       3,113,847 3,262,945    
Total investments in unconsolidated affiliates - equity method 203,876       188,666       203,876 188,666    
Long-lived assets 2,254,364       2,283,252       2,254,364 2,283,252    
Construction in progress payments not allocated                 39,500 84,800 232,300  
Construction in progress $ 199,275       307,360       199,275 307,360    
Accelerated depreciation                 $ 10,400 28,700 10,400  
Number of countries in which entity operates | Country 10               10      
Customer concentration risk | Sales revenue                        
Segment Reporting Information [Line Items]                        
Concentration risk, percentage                 63.00%      
Number of major oil and gas clients over 10% in any of the three comparative years | Customer                 1      
Number of clients over 10% over one year | Customer                 1      
U.K.                        
Segment Reporting Information [Line Items]                        
Revenues                 $ 510,796 587,493 616,191  
Long-lived assets $ 600,948       577,810       600,948 577,810    
Australia                        
Segment Reporting Information [Line Items]                        
Revenues                 216,562 272,407 228,774  
Long-lived assets 317,944       305,933       317,944 305,933    
Nigeria                        
Segment Reporting Information [Line Items]                        
Revenues                 204,521 246,449 327,164  
Long-lived assets 228,863       184,440       228,863 184,440    
United States                        
Segment Reporting Information [Line Items]                        
Revenues                 87,234 158,901 222,661  
Long-lived assets 298,804       292,324       298,804 292,324    
Canada                        
Segment Reporting Information [Line Items]                        
Revenues                 61,877 61,257 61,713  
Long-lived assets 204,842       180,665       204,842 180,665    
Norway                        
Segment Reporting Information [Line Items]                        
Revenues                 218,848 225,807 266,186  
Long-lived assets 268,892       171,948       268,892 171,948    
Falkland Islands                        
Segment Reporting Information [Line Items]                        
Revenues                 1,935 44,724 9,172  
Trinidad                        
Segment Reporting Information [Line Items]                        
Revenues                 57,531 55,423 59,073  
Long-lived assets 118,058       113,768       118,058 113,768    
Other countries                        
Segment Reporting Information [Line Items]                        
Revenues                 41,198 63,052 67,735  
Long-lived assets 16,738       149,004       16,738 149,004    
Intersegment elimination                        
Segment Reporting Information [Line Items]                        
Revenues                 11,520 15,755 16,749  
External customer                        
Segment Reporting Information [Line Items]                        
Revenues                 $ 1,400,502 $ 1,715,513 $ 1,858,669  
Customer 1 | Customer concentration risk | Sales revenue                        
Segment Reporting Information [Line Items]                        
Concentration risk, percentage                 9.00% 11.00% 12.00%  
Europe Caspian                        
Segment Reporting Information [Line Items]                        
Revenues                 $ 741,066 $ 863,852 $ 891,436  
Income (loss) from equity method investments                 273 310 1,107  
Operating income (loss) excluding gain loss from sale of property plant and equipment                 13,840 50,406 128,543  
Capital expenditures                 44,024 127,072 192,689  
Total depreciation and amortization                 39,511 41,509 37,830  
Total identifiable assets 1,091,536       1,067,647       1,091,536 1,067,647    
Total investments in unconsolidated affiliates - equity method 257       298       257 298    
Accelerated depreciation                 500 600    
Europe Caspian | Intersegment elimination                        
Segment Reporting Information [Line Items]                        
Revenues                 6,722 5,708 7,444  
Europe Caspian | External customer                        
Segment Reporting Information [Line Items]                        
Revenues                 734,344 858,144 883,992  
Africa                        
Segment Reporting Information [Line Items]                        
Revenues                 204,522 255,256 347,272  
Operating income (loss) excluding gain loss from sale of property plant and equipment                 30,179 19,702 91,758  
Capital expenditures                 4,575 1,386 1,330  
Total depreciation and amortization                 16,664 29,337 17,333  
Total identifiable assets 325,719       304,081       325,719 304,081    
Accelerated depreciation                 6,000 16,800 1,900  
Africa | Intersegment elimination                        
Segment Reporting Information [Line Items]                        
Revenues                 0 2 0  
Africa | External customer                        
Segment Reporting Information [Line Items]                        
Revenues                 204,522 255,254 347,272  
Americas                        
Segment Reporting Information [Line Items]                        
Revenues                 221,965 291,399 352,088  
Income (loss) from equity method investments                 5,207 (2,117) (4,946)  
Operating income (loss) excluding gain loss from sale of property plant and equipment                 4,224 34,463 79,176  
Capital expenditures                 8,275 92,418 124,854  
Total depreciation and amortization                 32,727 36,371 34,617  
Total identifiable assets 809,071       884,455       809,071 884,455    
Total investments in unconsolidated affiliates - equity method 200,362       183,990       200,362 183,990    
Accelerated depreciation                 3,900 6,000 2,500  
Americas | Intersegment elimination                        
Segment Reporting Information [Line Items]                        
Revenues                 4,465 7,834 6,003  
Americas | External customer                        
Segment Reporting Information [Line Items]                        
Revenues                 217,500 283,565 346,085  
Asia Pacific                        
Segment Reporting Information [Line Items]                        
Revenues                 233,903 296,842 257,605  
Operating income (loss) excluding gain loss from sale of property plant and equipment                 (20,870) 4,073 12,455  
Capital expenditures                 15,086 23,745 23,077  
Total depreciation and amortization                 19,091 20,526 23,450  
Total identifiable assets 433,614       426,677       433,614 426,677    
Accelerated depreciation                   5,300 6,000  
Asia Pacific | Intersegment elimination                        
Segment Reporting Information [Line Items]                        
Revenues                 1 2 254  
Asia Pacific | External customer                        
Segment Reporting Information [Line Items]                        
Revenues                 233,902 296,840 257,351  
Corporate and other                        
Segment Reporting Information [Line Items]                        
Revenues                 10,566 23,919 27,017  
Income (loss) from equity method investments                 (603) 0 0  
Operating income (loss) excluding gain loss from sale of property plant and equipment                 (104,616) (118,796) (130,209)  
Capital expenditures                 63,150 127,754 259,884  
Total depreciation and amortization                 10,755 9,069 1,063  
Total identifiable assets 453,907       580,085       453,907 580,085    
Total investments in unconsolidated affiliates - equity method $ 3,257       $ 4,378       3,257 4,378    
Corporate and other | Intersegment elimination                        
Segment Reporting Information [Line Items]                        
Revenues                 332 2,209 3,048  
Corporate and other | External customer                        
Segment Reporting Information [Line Items]                        
Revenues                 $ 10,234 $ 21,710 $ 23,969  
Helideck Certification Agency (HCA)                        
Segment Reporting Information [Line Items]                        
Equity investment ownership percentage                       50.00%