BASIS OF PRESENTATION, CONSOLIDATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	3 Months Ended		9 Months Ended		12 Months Ended	3 Months Ended	9 Months Ended			9 Months Ended		3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended			9 Months Ended	3 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	6 Months Ended	3 Months Ended	9 Months Ended																																																																																																			3 Months Ended	9 Months Ended
	Dec. 31, 2014 USD ($) aircraft	Dec. 31, 2013 USD ($) aircraft	Dec. 31, 2014 USD ($) aircraft	Dec. 31, 2013 USD ($) aircraft	Mar. 31, 2014 USD ($) aircraft	Dec. 31, 2014 Improper Capitalization Of Profit [Member] USD ($)	Dec. 31, 2014 Improper Capitalization Of Profit [Member] USD ($)	Dec. 31, 2014 Affiliated Entity [Member] USD ($)	Mar. 31, 2014 Affiliated Entity [Member] USD ($)	Dec. 31, 2014 Non Affiliated Entity [Member] USD ($)	Mar. 31, 2014 Non Affiliated Entity [Member] USD ($)	Dec. 31, 2013 FB Entities [Member] USD ($)	Dec. 31, 2013 FB Entities [Member] USD ($)	Dec. 31, 2013 FB Entities [Member] GBP (£)	Jun. 30, 2013 FB Entities [Member]	Dec. 31, 2014 HCA [Member] USD ($)	Dec. 31, 2014 HCA [Member] USD ($)	Dec. 31, 2014 HCA [Member] GBP (£)	Mar. 31, 2014 HCA [Member]	Dec. 31, 2013 Service Life [Member] USD ($)	Dec. 31, 2014 U.K. SAR and Norway Client [Member] USD ($)	Dec. 31, 2014 U.K. SAR and Norway Client [Member] USD ($)	Mar. 31, 2014 U.K. SAR and Norway Client [Member] USD ($)	Dec. 31, 2014 Air and related equipment [Member] USD ($)	Dec. 31, 2013 Air and related equipment [Member] USD ($)	Dec. 31, 2014 Air and related equipment [Member] USD ($)	Dec. 31, 2013 Air and related equipment [Member] USD ($)	Dec. 31, 2014 Other [Member] USD ($)	Dec. 31, 2013 Other [Member] USD ($)	Dec. 31, 2014 Other [Member] USD ($)	Dec. 31, 2013 Other [Member] USD ($)	Dec. 31, 2014 Medium Aircraft [Member] aircraft	Dec. 31, 2013 Medium Aircraft [Member] aircraft	Dec. 31, 2014 Medium Aircraft [Member] aircraft	Dec. 31, 2013 Medium Aircraft [Member] aircraft	Dec. 31, 2014 Large Aircraft [Member] aircraft	Dec. 31, 2013 Large Aircraft [Member] aircraft	Dec. 31, 2014 Large Aircraft [Member] aircraft	Dec. 31, 2013 Large Aircraft [Member] aircraft	Dec. 31, 2014 Older large aircraft [Member] USD ($) aircraft	Dec. 31, 2014 Older large aircraft [Member] USD ($) aircraft	Jun. 30, 2015 Older large aircraft [Member] Forecast [Member] USD ($) aircraft	Dec. 31, 2014 Senior Notes [Member] Senior Notes Due 2022 [Member] USD ($)	Dec. 31, 2014 Senior Notes [Member] Senior Notes Due 2022 [Member] USD ($)	Dec. 31, 2014 Senior Notes [Member] Senior Notes Due 2022 [Member] Quarter To Date [Member] USD ($)	Dec. 31, 2014 Senior Notes [Member] Senior Notes Due 2022 [Member] Year To Date [Member] USD ($)	Dec. 31, 2014 One British Pound Sterling Into Us Dollars [Member] Quarter To Date [Member]	Dec. 31, 2013 One British Pound Sterling Into Us Dollars [Member] Quarter To Date [Member]	Dec. 31, 2014 One British Pound Sterling Into Us Dollars [Member] Year To Date [Member]	Dec. 31, 2013 One British Pound Sterling Into Us Dollars [Member] Year To Date [Member]	Dec. 31, 2014 One British Pound Sterling Into Us Dollars [Member] Maximum [Member] Quarter To Date [Member]	Dec. 31, 2013 One British Pound Sterling Into Us Dollars [Member] Maximum [Member] Quarter To Date [Member]	Dec. 31, 2014 One British Pound Sterling Into Us Dollars [Member] Maximum [Member] Year To Date [Member]	Dec. 31, 2013 One British Pound Sterling Into Us Dollars [Member] Maximum [Member] Year To Date [Member]	Dec. 31, 2014 One British Pound Sterling Into Us Dollars [Member] Weighted Average [Member] Quarter To Date [Member]	Dec. 31, 2013 One British Pound Sterling Into Us Dollars [Member] Weighted Average [Member] Quarter To Date [Member]	Dec. 31, 2014 One British Pound Sterling Into Us Dollars [Member] Weighted Average [Member] Year To Date [Member]	Dec. 31, 2013 One British Pound Sterling Into Us Dollars [Member] Weighted Average [Member] Year To Date [Member]	Dec. 31, 2014 One British Pound Sterling Into Us Dollars [Member] Minimum [Member] Quarter To Date [Member]	Dec. 31, 2013 One British Pound Sterling Into Us Dollars [Member] Minimum [Member] Quarter To Date [Member]	Dec. 31, 2014 One British Pound Sterling Into Us Dollars [Member] Minimum [Member] Year To Date [Member]	Dec. 31, 2013 One British Pound Sterling Into Us Dollars [Member] Minimum [Member] Year To Date [Member]	Dec. 31, 2014 One Euro Into Us Dollars [Member] Quarter To Date [Member]	Dec. 31, 2013 One Euro Into Us Dollars [Member] Quarter To Date [Member]	Dec. 31, 2014 One Euro Into Us Dollars [Member] Year To Date [Member]	Dec. 31, 2013 One Euro Into Us Dollars [Member] Year To Date [Member]	Dec. 31, 2014 One Euro Into Us Dollars [Member] Maximum [Member] Quarter To Date [Member]	Dec. 31, 2013 One Euro Into Us Dollars [Member] Maximum [Member] Quarter To Date [Member]	Dec. 31, 2014 One Euro Into Us Dollars [Member] Maximum [Member] Year To Date [Member]	Dec. 31, 2013 One Euro Into Us Dollars [Member] Maximum [Member] Year To Date [Member]	Dec. 31, 2014 One Euro Into Us Dollars [Member] Weighted Average [Member] Quarter To Date [Member]	Dec. 31, 2013 One Euro Into Us Dollars [Member] Weighted Average [Member] Quarter To Date [Member]	Dec. 31, 2014 One Euro Into Us Dollars [Member] Weighted Average [Member] Year To Date [Member]	Dec. 31, 2013 One Euro Into Us Dollars [Member] Weighted Average [Member] Year To Date [Member]	Dec. 31, 2014 One Euro Into Us Dollars [Member] Minimum [Member] Quarter To Date [Member]	Dec. 31, 2013 One Euro Into Us Dollars [Member] Minimum [Member] Quarter To Date [Member]	Dec. 31, 2014 One Euro Into Us Dollars [Member] Minimum [Member] Year To Date [Member]	Dec. 31, 2013 One Euro Into Us Dollars [Member] Minimum [Member] Year To Date [Member]	Dec. 31, 2014 One Australian Dollar Into Us Dollars [Member] Quarter To Date [Member]	Dec. 31, 2013 One Australian Dollar Into Us Dollars [Member] Quarter To Date [Member]	Dec. 31, 2014 One Australian Dollar Into Us Dollars [Member] Year To Date [Member]	Dec. 31, 2013 One Australian Dollar Into Us Dollars [Member] Year To Date [Member]	Dec. 31, 2014 One Australian Dollar Into Us Dollars [Member] Maximum [Member] Quarter To Date [Member]	Dec. 31, 2013 One Australian Dollar Into Us Dollars [Member] Maximum [Member] Quarter To Date [Member]	Dec. 31, 2014 One Australian Dollar Into Us Dollars [Member] Maximum [Member] Year To Date [Member]	Dec. 31, 2013 One Australian Dollar Into Us Dollars [Member] Maximum [Member] Year To Date [Member]	Dec. 31, 2014 One Australian Dollar Into Us Dollars [Member] Weighted Average [Member] Quarter To Date [Member]	Dec. 31, 2013 One Australian Dollar Into Us Dollars [Member] Weighted Average [Member] Quarter To Date [Member]	Dec. 31, 2014 One Australian Dollar Into Us Dollars [Member] Weighted Average [Member] Year To Date [Member]	Dec. 31, 2013 One Australian Dollar Into Us Dollars [Member] Weighted Average [Member] Year To Date [Member]	Dec. 31, 2014 One Australian Dollar Into Us Dollars [Member] Minimum [Member] Quarter To Date [Member]	Dec. 31, 2013 One Australian Dollar Into Us Dollars [Member] Minimum [Member] Quarter To Date [Member]	Dec. 31, 2014 One Australian Dollar Into Us Dollars [Member] Minimum [Member] Year To Date [Member]	Dec. 31, 2013 One Australian Dollar Into Us Dollars [Member] Minimum [Member] Year To Date [Member]	Dec. 31, 2014 One Norwegian Kroner Into US Dollars [Member] Quarter To Date [Member]	Dec. 31, 2013 One Norwegian Kroner Into US Dollars [Member] Quarter To Date [Member]	Dec. 31, 2014 One Norwegian Kroner Into US Dollars [Member] Year To Date [Member]	Dec. 31, 2013 One Norwegian Kroner Into US Dollars [Member] Year To Date [Member]	Dec. 31, 2014 One Norwegian Kroner Into US Dollars [Member] Maximum [Member] Quarter To Date [Member]	Dec. 31, 2013 One Norwegian Kroner Into US Dollars [Member] Maximum [Member] Quarter To Date [Member]	Dec. 31, 2014 One Norwegian Kroner Into US Dollars [Member] Maximum [Member] Year To Date [Member]	Dec. 31, 2013 One Norwegian Kroner Into US Dollars [Member] Maximum [Member] Year To Date [Member]	Dec. 31, 2014 One Norwegian Kroner Into US Dollars [Member] Weighted Average [Member] Quarter To Date [Member]	Dec. 31, 2013 One Norwegian Kroner Into US Dollars [Member] Weighted Average [Member] Quarter To Date [Member]	Dec. 31, 2014 One Norwegian Kroner Into US Dollars [Member] Weighted Average [Member] Year To Date [Member]	Dec. 31, 2013 One Norwegian Kroner Into US Dollars [Member] Weighted Average [Member] Year To Date [Member]	Dec. 31, 2014 One Norwegian Kroner Into US Dollars [Member] Minimum [Member] Quarter To Date [Member]	Dec. 31, 2013 One Norwegian Kroner Into US Dollars [Member] Minimum [Member] Quarter To Date [Member]	Dec. 31, 2014 One Norwegian Kroner Into US Dollars [Member] Minimum [Member] Year To Date [Member]	Dec. 31, 2013 One Norwegian Kroner Into US Dollars [Member] Minimum [Member] Year To Date [Member]	Dec. 31, 2014 One Nigerian Naira Into Us Dollars [Member] Quarter To Date [Member]	Dec. 31, 2013 One Nigerian Naira Into Us Dollars [Member] Quarter To Date [Member]	Dec. 31, 2014 One Nigerian Naira Into Us Dollars [Member] Year To Date [Member]	Dec. 31, 2013 One Nigerian Naira Into Us Dollars [Member] Year To Date [Member]	Dec. 31, 2014 One Nigerian Naira Into Us Dollars [Member] Maximum [Member] Quarter To Date [Member]	Dec. 31, 2013 One Nigerian Naira Into Us Dollars [Member] Maximum [Member] Quarter To Date [Member]	Dec. 31, 2014 One Nigerian Naira Into Us Dollars [Member] Maximum [Member] Year To Date [Member]	Dec. 31, 2013 One Nigerian Naira Into Us Dollars [Member] Maximum [Member] Year To Date [Member]	Dec. 31, 2014 One Nigerian Naira Into Us Dollars [Member] Weighted Average [Member] Quarter To Date [Member]	Dec. 31, 2013 One Nigerian Naira Into Us Dollars [Member] Weighted Average [Member] Quarter To Date [Member]	Dec. 31, 2014 One Nigerian Naira Into Us Dollars [Member] Weighted Average [Member] Year To Date [Member]	Dec. 31, 2013 One Nigerian Naira Into Us Dollars [Member] Weighted Average [Member] Year To Date [Member]	Dec. 31, 2014 One Nigerian Naira Into Us Dollars [Member] Minimum [Member] Quarter To Date [Member]	Dec. 31, 2013 One Nigerian Naira Into Us Dollars [Member] Minimum [Member] Quarter To Date [Member]	Dec. 31, 2014 One Nigerian Naira Into Us Dollars [Member] Minimum [Member] Year To Date [Member]	Dec. 31, 2013 One Nigerian Naira Into Us Dollars [Member] Minimum [Member] Year To Date [Member]	Dec. 31, 2014 One Brazilian Real Into Us Dollars [Member] Quarter To Date [Member]	Dec. 31, 2013 One Brazilian Real Into Us Dollars [Member] Quarter To Date [Member]	Dec. 31, 2014 One Brazilian Real Into Us Dollars [Member] Year To Date [Member]	Dec. 31, 2013 One Brazilian Real Into Us Dollars [Member] Year To Date [Member]	Dec. 31, 2014 One Brazilian Real Into Us Dollars [Member] Maximum [Member] Quarter To Date [Member]	Dec. 31, 2013 One Brazilian Real Into Us Dollars [Member] Maximum [Member] Quarter To Date [Member]	Dec. 31, 2014 One Brazilian Real Into Us Dollars [Member] Maximum [Member] Year To Date [Member]	Dec. 31, 2013 One Brazilian Real Into Us Dollars [Member] Maximum [Member] Year To Date [Member]	Dec. 31, 2014 One Brazilian Real Into Us Dollars [Member] Weighted Average [Member] Quarter To Date [Member]	Dec. 31, 2013 One Brazilian Real Into Us Dollars [Member] Weighted Average [Member] Quarter To Date [Member]	Dec. 31, 2014 One Brazilian Real Into Us Dollars [Member] Weighted Average [Member] Year To Date [Member]	Dec. 31, 2013 One Brazilian Real Into Us Dollars [Member] Weighted Average [Member] Year To Date [Member]	Dec. 31, 2014 One Brazilian Real Into Us Dollars [Member] Minimum [Member] Quarter To Date [Member]	Dec. 31, 2013 One Brazilian Real Into Us Dollars [Member] Minimum [Member] Quarter To Date [Member]	Dec. 31, 2014 One Brazilian Real Into Us Dollars [Member] Minimum [Member] Year To Date [Member]	Dec. 31, 2013 One Brazilian Real Into Us Dollars [Member] Minimum [Member] Year To Date [Member]	Dec. 31, 2014 Impact of Changes in Foreign Currency Exchange Rates [Member] Quarter To Date [Member] USD ($)	Dec. 31, 2014 Impact of Changes in Foreign Currency Exchange Rates [Member] Year To Date [Member] USD ($)
Foreign Currency [Line Items]
Foreign currency exchange rates																																															1.56	1.65	1.56	1.65	1.62	1.65	1.72	1.65	1.58	1.62	1.64	1.57	1.55	1.59	1.55	1.48	1.21	1.38	1.21	1.38	1.28	1.38	1.39	1.38	1.25	1.36	1.31	1.33	1.21	1.34	1.21	1.28	0.82	0.89	0.82	0.89	0.89	0.97	0.95	1.07	0.85	0.93	0.90	0.95	0.81	0.89	0.81	0.89	0.1345	0.1634	0.1345	0.1634	0.1554	0.1698	0.1698	0.1753	0.1458	0.1652	0.1577	0.1680	0.1336	0.1614	0.1336	0.1601	0.0055	0.0063	0.0055	0.0063	0.0062	0.0064	0.0063	0.0065	0.0059	0.0063	0.0061	0.0063	0.0054	0.0062	0.0054	0.0061	0.3731	0.4258	0.3731	0.4258	0.4204	0.4631	0.4572	0.5123	0.3944	0.4406	0.4284	0.4547	0.3673	0.4197	0.3673	0.4093
Foreign Currency Transaction Gain (Loss), before Tax	$ (4,600,000)	$ (500,000)	$ (6,700,000)	$ (1,500,000)
Impact of Foreign Exchange Rates on Unconsolidated affiliates	(7,700,000)	(2,400,000)	(16,100,000)	(4,800,000)
Revenue	460,140,000	412,335,000	1,408,314,000	1,228,657,000		(3,500,000)																																																																																																																																									(15,518,000)	4,337,000
Operating expense	(423,935,000)	(370,870,000)	(1,264,967,000)	(1,089,413,000)																																																																																																																																											12,496,000	387,000
Earnings from unconsolidated affiliates, net of losses	(958,000)	(15,945,000)	419,000	1,115,000																																																																																																																																											(5,316,000)	(11,214,000)
Non-operating expense																																																																																																																																															(4,032,000)	(5,153,000)
Income before provision for income taxes	638,000	21,960,000	91,275,000	207,492,000																																																																																																																																											(12,370,000)	(11,643,000)
Provision for income taxes	(567,000)	(2,946,000)	(18,376,000)	(51,682,000)								0	(36,300,000)																																																																																																																																		2,598,000	2,445,000
Net income	71,000	19,014,000	72,899,000	155,810,000																																																																																																																																											(9,772,000)	(9,198,000)
Cumulative translation adjustment																																																																																																																																															(17,794,000)	(28,276,000)
Total stockholders' investment	1,694,205,000		1,694,205,000		1,756,586,000																																																																																																																																										(27,566,000)	(37,474,000)
Interest Income (Expense), Net [Abstract]
Interest income	118,000	407,000	740,000	1,288,000
Interest expense	(7,094,000)	(7,253,000)	(22,415,000)	(36,701,000)
Interest expense, net	(6,976,000)	(6,846,000)	(21,675,000)	(35,413,000)
Write-off of deferred debt financing fees			660,000	12,733,000																																							200,000	660,000
Debt Instrument, Repurchase Amount																																													17,200,000	48,500,000
Proceeds from Divestiture of Interest in Subsidiaries and Affiliates [Abstract]
Equity Method Investment, Ownership Percentage															50.00%				50.00%
Proceeds from sale of unconsolidated affiliate			4,185,000	112,210,000									112,200,000	74,000,000			4,185,000	2,700,000
Gain on sale of unconsolidated affiliates	3,921,000	0	3,921,000	103,924,000									103,924,000			3,921,000	3,921,000
Other Income and Expenses [Abstract]
Other income (expense)												1,100,000	1,100,000																														(700,000)	(2,600,000)
Receivables [Abstract]
Allowance For Doubtful Accounts								0	0	600,000	5,000,000
Allowance for Doubtful Accounts Receivable, Recoveries										4,400,000
Allowance for Doubtful Accounts Receivable, Write-offs										500,000
Inventory Disclosure [Abstract]
Inventory allowance	49,700,000		49,700,000		46,000,000
Additional allowances	3,800,000		7,200,000	2,400,000
Prepaid Expense and Other Assets [Abstract]
Deferred Set-up Costs, Current																					2,900,000	2,900,000	5,500,000
Expense of Deferred Set-up Costs																					500,000	1,900,000
Other Assets [Abstract]
Deferred Contract Acquisition Cost, Non Current																					36,300,000	36,300,000	15,200,000
Property, Plant and Equipment [Abstract]
Number of aircraft delivered	6	7	17	17																												2	3	5	8	4	4	12	9
Capital expenditures	197,166,000	186,489,000	499,285,000	526,048,000																				165,269,000	171,874,000	402,753,000	484,754,000	31,897,000	14,615,000	96,532,000	41,294,000
Payments for PP&E	159,200,000	160,400,000	383,400,000	460,900,000
Number of aircraft sold or disposed of	3	17	26	32
Proceeds from sale or disposal of assets	6,717,000	89,264,000	404,361,000	244,867,000
Gain (loss) on disposal of assets	(26,331,000)	3,982,000	(25,594,000)	(803,000)																				(717,000)	5,216,000	3,157,000	2,611,000
Number of aircraft impaired	12	3	18	6																																				10	10	7
Impairment charges on aircraft held for sale	(25,614,000)	(1,234,000)	(28,751,000)	(3,414,000)																																				(24,500,000)	(24,500,000)
Number of aircraft sale leaseback	0	6	14	13
Sale leaseback transaction, gross proceeds		72,300,000	380,700,000	217,900,000
Property, Plant and Equipment, Net	2,129,388,000		2,129,388,000		2,268,751,000	(4,400,000)	(4,400,000)
Other Liabilities, Noncurrent	59,953,000		59,953,000		78,126,000	900,000	900,000
Revenue	460,140,000	412,335,000	1,408,314,000	1,228,657,000		(3,500,000)																																																																																																																																									(15,518,000)	4,337,000
Direct cost	299,230,000	261,590,000	898,650,000	773,612,000		2,000,000	4,100,000
Depreciation and amortization	23,625,000	23,655,000	77,164,000	70,332,000		(200,000)														(2,700,000)																						17,000,000
Deferred Sale Leaseback Abstract [Abstract]
Deferred sale leaseback advance total	55,671,000		55,671,000		166,300,000
Deferred sale leaseback advance - current	55,671,000		55,671,000		136,930,000
Deferred sale leaseback advance - long-term	0		0		29,400,000
Proceeds from Assignment of Aircraft Purchase Agreement					106,100,000
Number of aircraft assigned future payments			2		7
Deferred sale leaseback progress payments					129,800,000
Number Of Movement Into (Out Of) Deferred Sale Leaseback Advance			(5)
Completion of deferred sale leaseback			183,688,000	0
Removal of Deferred Sale Leaseback Advance			$ 182,600,000