BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended			9 Months Ended
	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) aircraft	Dec. 31, 2015 USD ($) aircraft	Dec. 31, 2016 USD ($) aircraft	Dec. 31, 2015 USD ($) aircraft	Dec. 31, 2016 USD ($) Customer	Nov. 30, 2016 USD ($)	Mar. 31, 2016 USD ($) Customer	Nov. 01, 2015
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency transaction gain (loss)		$ 1,600,000	$ 600,000	$ (1,800,000)	$ (7,000,000)
Interest income		168,000	181,000	637,000	619,000
Interest expense		(12,347,000)	(9,717,000)	(35,170,000)	(25,003,000)
Interest expense, net		(12,179,000)	(9,536,000)	(34,533,000)	(24,384,000)
Accretion of redeemable noncontrolling interests		0	0	0	1,498,000
Allowance for doubtful accounts						$ 4,500,000		$ 5,600,000
Inventory allowance						25,500,000		27,800,000
Impairment of inventories		0	0	7,572,000	5,439,000
Deferred set-up costs, current						15,500,000		12,100,000
Expense of deferred set-up costs		2,500,000		8,200,000
Goodwill	$ 18,793,000	18,793,000		29,990,000		18,793,000	$ 27,500,000	29,990,000
Goodwill - beginning balance	18,793,000			29,990,000
Goodwill impairment		(8,706,000)	$ 0	(8,706,000)	$ (22,274,000)
Goodwill, foreign currency translation				(2,491,000)
Goodwill - ending balance		18,793,000		18,793,000
Accumulated goodwill impairment loss - beginning balance	(50,861,000)			(42,155,000)
Accumulated goodwill impairment loss - ending balance		(50,861,000)		(50,861,000)
Other intangible asset, gross - beginning balance	27,046,000			27,858,000
Other intangible asset, foreign currency translation				(812,000)
Other intangible asset, gross - ending balance		27,046,000		27,046,000
Other intangible asset, accumulated amortization - beginning balance	(21,210,000)			(20,379,000)
Other intangible asset - amortization expense				(831,000)
Other intangible asset, accumulated amortization - ending balance		(21,210,000)		$ (21,210,000)
Weighted average remaining contractual life, in years				4 years 1 month
Other intangible asset, amortization expense, remainder of fiscal year 2017						209,000
Other intangible asset, amortization expense, year 2018						825,000
Other intangible asset, amortization expense, year 2019						704,000
Other intangible asset, amortization expense, year 2020						433,000
Other intangible asset, amortization expense, year 2021						433,000
Other intangible asset, amortization expense, thereafter						3,232,000
Other intangible asset, net						5,836,000
Intangible asset impairment		$ 0
Deferred contract acquisition cost, non current						49,800,000		55,100,000
Number of aircraft delivered | aircraft		1	8	7	11
Capital expenditures		$ 17,860,000	$ 196,376,000	$ 119,726,000	$ 343,365,000
Payments for PP&E		$ 0	$ 136,800,000	$ 66,800,000	$ 201,100,000
Number of aircraft sold or disposed of | aircraft		3	3	9	16
Proceeds from sale or disposal of assets		$ 2,525,000	$ 3,045,000	$ 14,344,000	$ 19,152,000
Gain (loss) on disposal of assets		$ 874,000	$ 2,154,000	$ 13,077,000	$ 23,856,000
Number of aircraft impaired | aircraft		1	0	13	11
Impairment charges on aircraft held for sale		$ 200,000	$ 0	$ 11,360,000	$ 22,031,000
Accelerated depreciation		$ 1,100,000	$ 5,000,000	$ 9,300,000	$ 22,400,000
Number of aircraft in exit plan | aircraft		5	21	11	21
Unamortized debt issuance cost						9,020,000		8,917,000
Revenue		$ 337,443,000	$ 419,887,000	$ 1,064,308,000	$ 1,333,794,000
Operating expense		(347,726,000)	(403,348,000)	(1,111,944,000)	(1,283,775,000)
Earnings from unconsolidated affiliates, net of losses		766,000	7,692,000	4,777,000	(1,372,000)
Income (loss) before benefit (provision) for income taxes		(29,608,000)	13,191,000	(108,265,000)	(34,241,000)
Benefit (provision) for income taxes		3,560,000	(9,623,000)	11,038,000	(9,500,000)
Net income (loss)		(26,048,000)	3,568,000	(97,227,000)	(43,741,000)
Total stockholders' investment						1,373,034,000		1,509,892,000
Forecast
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Accelerated depreciation	1,100,000
Aircraft
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Capital expenditures		17,196,000	165,394,000	112,770,000	276,547,000
Gain (loss) on disposal of assets		674,000	2,154,000	1,717,000	1,825,000
Other property plant and equipment
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Capital expenditures		$ 664,000	$ 30,982,000	$ 6,956,000	$ 66,818,000
Medium aircraft
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Number of aircraft delivered | aircraft		0	0	5	1
Large aircraft
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Number of aircraft delivered | aircraft		0	2	0	2
SAR Aircraft
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Number of aircraft delivered | aircraft		1	6	2	8
Client contracts
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Other intangible asset, gross - beginning balance	8,164,000			$ 8,170,000
Other intangible asset, foreign currency translation				(6,000)
Other intangible asset, gross - ending balance		$ 8,164,000		8,164,000
Other intangible asset, accumulated amortization - beginning balance	(8,144,000)			(8,062,000)
Other intangible asset - amortization expense				(82,000)
Other intangible asset, accumulated amortization - ending balance		(8,144,000)		$ (8,144,000)
Weighted average remaining contractual life, in years				1 month
Customer relationships
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Other intangible asset, gross - beginning balance	12,657,000			$ 12,779,000
Other intangible asset, foreign currency translation				(122,000)
Other intangible asset, gross - ending balance		12,657,000		12,657,000
Other intangible asset, accumulated amortization - beginning balance	(10,953,000)			(10,600,000)
Other intangible asset - amortization expense				(353,000)
Other intangible asset, accumulated amortization - ending balance		(10,953,000)		$ (10,953,000)
Weighted average remaining contractual life, in years				3 years 5 months
Trade names and trademarks
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Other intangible asset, gross - beginning balance	4,424,000			$ 5,008,000
Other intangible asset, foreign currency translation				(584,000)
Other intangible asset, gross - ending balance		4,424,000		4,424,000
Other intangible asset, accumulated amortization - beginning balance	(838,000)			(636,000)
Other intangible asset - amortization expense				(202,000)
Other intangible asset, accumulated amortization - ending balance		(838,000)		$ (838,000)
Weighted average remaining contractual life, in years				8 years 11 months
Internally developed software
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Other intangible asset, gross - beginning balance	1,055,000			$ 1,149,000
Other intangible asset, foreign currency translation				(94,000)
Other intangible asset, gross - ending balance		1,055,000		1,055,000
Other intangible asset, accumulated amortization - beginning balance	(632,000)			(480,000)
Other intangible asset - amortization expense				(152,000)
Other intangible asset, accumulated amortization - ending balance		(632,000)		$ (632,000)
Weighted average remaining contractual life, in years				1 year 5 months
Licensing
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Other intangible asset, gross - beginning balance	746,000			$ 752,000
Other intangible asset, foreign currency translation				(6,000)
Other intangible asset, gross - ending balance		746,000		746,000
Other intangible asset, accumulated amortization - beginning balance	(643,000)			(601,000)
Other intangible asset - amortization expense				(42,000)
Other intangible asset, accumulated amortization - ending balance		(643,000)		$ (643,000)
Weighted average remaining contractual life, in years				1 year 2 months
Europe Caspian
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Goodwill	0	0		$ 10,026,000		0	8,700,000	10,026,000
Goodwill - beginning balance	0			10,026,000
Goodwill impairment				(8,706,000)
Goodwill, foreign currency translation				(1,320,000)
Goodwill - ending balance		0		0
Accumulated goodwill impairment loss - beginning balance	(33,883,000)			(25,177,000)
Accumulated goodwill impairment loss - ending balance		(33,883,000)		(33,883,000)
Accelerated depreciation				400,000
Revenue		180,910,000	$ 209,154,000	571,598,000	$ 658,678,000
Africa
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Goodwill impairment				0
Accumulated goodwill impairment loss - beginning balance	(6,179,000)			(6,179,000)
Accumulated goodwill impairment loss - ending balance		(6,179,000)		(6,179,000)
Accelerated depreciation		1,100,000	5,000,000	5,000,000	11,600,000
Revenue		50,516,000	63,287,000	156,422,000	207,503,000
Americas
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Goodwill impairment				0
Accumulated goodwill impairment loss - beginning balance	(576,000)			(576,000)
Accumulated goodwill impairment loss - ending balance		(576,000)		(576,000)
Accelerated depreciation				3,900,000	4,500,000
Revenue		53,339,000	72,232,000	169,590,000	226,062,000
Asia Pacific
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Goodwill	18,793,000	18,793,000		19,964,000		$ 18,793,000	$ 18,800,000	$ 19,964,000
Goodwill - beginning balance	18,793,000			19,964,000
Goodwill impairment				0
Goodwill, foreign currency translation				(1,171,000)
Goodwill - ending balance		18,793,000		18,793,000
Accelerated depreciation					6,300,000
Revenue		52,857,000	73,598,000	167,257,000	232,679,000
Corporate And Other
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Goodwill impairment				0
Accumulated goodwill impairment loss - beginning balance	$ (10,223,000)			(10,223,000)
Accumulated goodwill impairment loss - ending balance		(10,223,000)		(10,223,000)
Revenue		2,114,000	3,724,000	8,006,000	18,877,000
Nigeria
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Number of uncollectible receivables | Customer						2		2
Australia
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Number of uncollectible receivables | Customer						1		1
Unconsolidated affiliate
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency transaction gain (loss)		(1,200,000)	$ 1,000,000	(2,500,000)	$ (17,200,000)
Affiliated entity
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Allowance for doubtful accounts						$ 0		$ 0
Eastern Airways
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Goodwill				(13,100,000)				$ (13,100,000)
Goodwill - beginning balance				(13,100,000)
Goodwill impairment		(8,706,000)		(8,706,000)
One British Pound Sterling Into US Dollars | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.47		1.47	1.24
One British Pound Sterling Into US Dollars | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.47		1.47	1.24
One British Pound Sterling Into US Dollars | Maximum | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.55		1.55	1.30
One British Pound Sterling Into US Dollars | Maximum | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.59		1.59	1.48
One British Pound Sterling Into US Dollars | Weighted average | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.52		1.52	1.24
One British Pound Sterling Into US Dollars | Weighted average | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.53		1.53	1.33
One British Pound Sterling Into US Dollars | Minimum | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.47		1.47	1.21
One British Pound Sterling Into US Dollars | Minimum | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.46		1.46	1.21
One Euro Into US Dollars | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.09		1.09	1.05
One Euro Into US Dollars | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.09		1.09	1.05
One Euro Into US Dollars | Maximum | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.14		1.14	1.12
One Euro Into US Dollars | Maximum | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.16		1.16	1.15
One Euro Into US Dollars | Weighted average | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.10		1.10	1.08
One Euro Into US Dollars | Weighted average | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.10		1.10	1.11
One Euro Into US Dollars | Minimum | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.06		1.06	1.04
One Euro Into US Dollars | Minimum | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			1.06		1.06	1.04
One Australian Dollar Into US Dollars | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.73		0.73	0.72
One Australian Dollar Into US Dollars | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.73		0.73	0.72
One Australian Dollar Into US Dollars | Maximum | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.74		0.74	0.77
One Australian Dollar Into US Dollars | Maximum | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.81		0.81	0.78
One Australian Dollar Into US Dollars | Weighted average | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.72		0.72	0.75
One Australian Dollar Into US Dollars | Weighted average | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.74		0.74	0.75
One Australian Dollar Into US Dollars | Minimum | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.70		0.70	0.72
One Australian Dollar Into US Dollars | Minimum | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.69		0.69	0.72
One Norwegian Kroner Into US Dollars | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.1130		0.1130	0.1162
One Norwegian Kroner Into US Dollars | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.1130		0.1130	0.1162
One Norwegian Kroner Into US Dollars | Maximum | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.1240		0.1240	0.1253
One Norwegian Kroner Into US Dollars | Maximum | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.1367		0.1367	0.1253
One Norwegian Kroner Into US Dollars | Weighted average | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.1174		0.1174	0.1193
One Norwegian Kroner Into US Dollars | Weighted average | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.1227		0.1227	0.1202
One Norwegian Kroner Into US Dollars | Minimum | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.1130		0.1130	0.1145
One Norwegian Kroner Into US Dollars | Minimum | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.1130		0.1130	0.1145
One Nigerian Naira Into US Dollars | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.0050		0.0050	0.0032
One Nigerian Naira Into US Dollars | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.0050		0.0050	0.0032
One Nigerian Naira Into US Dollars | Maximum | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.0050		0.0050	0.0032
One Nigerian Naira Into US Dollars | Maximum | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.0050		0.0050	0.0050
One Nigerian Naira Into US Dollars | Weighted average | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.0050		0.0050	0.0032
One Nigerian Naira Into US Dollars | Weighted average | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.0050		0.0050	0.0037
One Nigerian Naira Into US Dollars | Minimum | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.0050		0.0050	0.0031
One Nigerian Naira Into US Dollars | Minimum | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.0050		0.0050	0.0029
One Brazilian Real Into US Dollars | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.2528		0.2528	0.3073
One Brazilian Real Into US Dollars | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.2528		0.2528	0.3073
One Brazilian Real Into US Dollars | Maximum | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.2694		0.2694	0.3207
One Brazilian Real Into US Dollars | Maximum | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.3437		0.3437	0.3207
One Brazilian Real Into US Dollars | Weighted average | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.2602		0.2602	0.3032
One Brazilian Real Into US Dollars | Weighted average | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.2899		0.2899	0.2988
One Brazilian Real Into US Dollars | Minimum | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.2479		0.2479	0.2866
One Brazilian Real Into US Dollars | Minimum | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Foreign currency exchange rates			0.2378		0.2378	0.2702
Impact of Changes in Foreign Currency Exchange Rates | Quarter To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Revenue		(25,785,000)
Operating expense		22,564,000
Earnings from unconsolidated affiliates, net of losses		(2,197,000)
Non-operating expense		1,022,000
Income (loss) before benefit (provision) for income taxes		(4,396,000)
Benefit (provision) for income taxes		557,000
Net income (loss)		(3,839,000)
Cumulative translation adjustment		$ (19,583,000)
Total stockholders' investment						$ (23,422,000)
Impact of Changes in Foreign Currency Exchange Rates | Year To Date
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Revenue				(63,817,000)
Operating expense				59,035,000
Earnings from unconsolidated affiliates, net of losses				14,655,000
Non-operating expense				5,191,000
Income (loss) before benefit (provision) for income taxes				15,064,000
Benefit (provision) for income taxes				(5,470,000)
Net income (loss)				9,594,000
Cumulative translation adjustment				$ (37,122,000)
Total stockholders' investment						$ (27,528,000)
Airnorth
Basis of Presentation, Consolidation and Summary of Significant Accounting Policies [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired									15.00%