SEGMENT INFORMATION (Details) (USD $)	3 Months Ended								12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 440,925,000	$ 412,335,000	$ 417,328,000	$ 398,994,000	$ 391,642,000	$ 388,469,000	$ 365,754,000	$ 362,608,000	$ 1,669,582,000	$ 1,508,473,000	$ 1,341,803,000
Income (Loss) from Equity Method Investments									8,666,000	25,042,000	8,282,000
Operating income	47,421,000	29,502,000	53,935,000	56,119,000	62,703,000	74,120,000	47,328,000	39,993,000	186,977,000	224,144,000	115,766,000
Gain (loss) on disposal of assets	100,000	4,000,000	(3,100,000)	(1,700,000)	7,200,000	7,400,000	(1,300,000)	(5,300,000)	(722,000)	8,068,000	(31,670,000)
Capital expenditures									628,613,000	571,425,000	326,420,000
Total depreciation and amortization									95,977,000	96,284,000	96,144,000
Total identifiable assets	3,398,257,000				2,950,692,000				3,398,257,000	2,950,692,000
Total investments in unconsolidated affiliates - equity method	256,329,000				265,837,000				256,329,000	265,837,000
Long-Lived Assets	2,268,751,000				1,921,072,000				2,268,751,000	1,921,072,000
Construction in progress payments not allocated									494,500,000	140,100,000	111,900,000
Construction in progress within property and equipment	477,900,000				222,800,000				477,900,000	222,800,000
Total property and equipment, net	2,268,751,000				1,921,072,000				2,268,751,000	1,921,072,000
Countries operated in									20
Top ten clients percentage									61.30%
One [Member]
Segment Reporting Information [Line Items]
Percentage to client over ten percent									13.00%	13.00%	12.00%
External Customer [Member]
Segment Reporting Information [Line Items]
Revenues									1,669,582,000	1,508,473,000	1,341,803,000
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Revenues									4,455,000	2,337,000	1,740,000
U.K.
Segment Reporting Information [Line Items]
Revenues									526,149,000	383,398,000	345,405,000
Long-Lived Assets	544,113,000				394,557,000				544,113,000	394,557,000
NIGERIA
Segment Reporting Information [Line Items]
Revenues									328,793,000	296,933,000	258,258,000
Long-Lived Assets	256,239,000				242,095,000				256,239,000	242,095,000
CANADA
Segment Reporting Information [Line Items]
Revenues									32,895,000	16,447,000	0
Long-Lived Assets	199,861,000				211,316,000				199,861,000	211,316,000
NORWAY
Segment Reporting Information [Line Items]
Revenues									253,651,000	249,023,000	200,926,000
Long-Lived Assets	155,690,000				162,591,000				155,690,000	162,591,000
UNITED STATES
Segment Reporting Information [Line Items]
Revenues									225,650,000	237,311,000	208,931,000
Long-Lived Assets	128,124,000				183,890,000				128,124,000	183,890,000
AUSTRALIA
Segment Reporting Information [Line Items]
Revenues									168,424,000	186,752,000	162,727,000
Long-Lived Assets	188,370,000				180,914,000				188,370,000	180,914,000
BRAZIL
Segment Reporting Information [Line Items]
Long-Lived Assets	123,439,000				113,562,000				123,439,000	113,562,000
MALAYSIA
Segment Reporting Information [Line Items]
Revenues									14,316,000	25,284,000	26,416,000
Long-Lived Assets	61,104,000				101,764,000				61,104,000	101,764,000
TRINIDAD
Segment Reporting Information [Line Items]
Revenues									51,770,000	43,763,000	39,478,000
Long-Lived Assets	64,520,000				51,004,000				64,520,000	51,004,000
TANZANIA
Segment Reporting Information [Line Items]
Long-Lived Assets	42,589,000				0				42,589,000	0
OTHER COUNTRIES
Segment Reporting Information [Line Items]
Revenues									67,934,000	69,562,000	99,662,000
Long-Lived Assets	26,769,000				56,562,000				26,769,000	56,562,000
Construction in progress attributable to aircraft [Member]
Segment Reporting Information [Line Items]
Long-Lived Assets	477,933,000				222,817,000				477,933,000	222,817,000
Europe [Member]
Segment Reporting Information [Line Items]
Revenues									740,316,000	619,545,000	559,697,000
Income (Loss) from Equity Method Investments									4,446,000	10,517,000	11,014,000
Operating income									114,729,000	111,785,000	94,277,000
Capital expenditures									38,294,000	175,270,000	66,016,000
Total depreciation and amortization									32,383,000	33,101,000	34,345,000
Total identifiable assets	932,803,000				808,568,000				932,803,000	808,568,000
Total investments in unconsolidated affiliates - equity method	1,067,000				8,569,000				1,067,000	8,569,000
Europe [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Revenues									740,316,000	619,480,000	559,306,000
Europe [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Revenues									0	65,000	391,000
West Africa [Member]
Segment Reporting Information [Line Items]
Revenues									328,793,000	296,933,000	258,258,000
Operating income									80,053,000	70,315,000	63,768,000
Capital expenditures									24,324,000	11,501,000	13,375,000
Total depreciation and amortization									13,923,000	13,077,000	12,805,000
Total identifiable assets	454,161,000				390,402,000				454,161,000	390,402,000
West Africa [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Revenues									328,793,000	296,933,000	258,258,000
North America [Member]
Segment Reporting Information [Line Items]
Revenues									230,340,000	226,397,000	177,817,000
Income (Loss) from Equity Method Investments									1,053,000	(736,000)	0
Operating income									32,255,000	27,538,000	8,378,000
Capital expenditures									24,427,000	201,439,000	53,367,000
Total depreciation and amortization									23,505,000	20,193,000	16,243,000
Total identifiable assets	487,659,000				527,710,000				487,659,000	527,710,000
Total investments in unconsolidated affiliates - equity method	61,570,000				60,517,000				61,570,000	60,517,000
North America [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Revenues									230,337,000	226,114,000	176,797,000
North America [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Revenues									3,000	283,000	1,020,000
Other International [Member]
Segment Reporting Information [Line Items]
Revenues									134,021,000	132,662,000	145,593,000
Income (Loss) from Equity Method Investments									3,167,000	15,261,000	(2,732,000)
Operating income									33,769,000	45,201,000	36,343,000
Capital expenditures									28,136,000	33,147,000	48,498,000
Total depreciation and amortization									15,024,000	17,018,000	16,660,000
Total identifiable assets	579,571,000				589,361,000				579,571,000	589,361,000
Total investments in unconsolidated affiliates - equity method	193,692,000				196,751,000				193,692,000	196,751,000
Other International [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Revenues									134,021,000	132,662,000	145,593,000
Australia [Member]
Segment Reporting Information [Line Items]
Revenues									168,424,000	186,752,000	163,189,000
Operating income									5,523,000	25,283,000	19,840,000
Capital expenditures									7,058,000	3,736,000	2,421,000
Total depreciation and amortization									8,728,000	9,995,000	11,352,000
Total identifiable assets	260,483,000				245,757,000				260,483,000	245,757,000
Australia [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Revenues									168,424,000	186,752,000	162,727,000
Australia [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Revenues									0	0	462,000
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenues									72,143,000	48,521,000	38,989,000
Operating income									(78,630,000)	(64,046,000)	(75,170,000)
Capital expenditures									506,374,000	146,332,000	142,743,000
Total depreciation and amortization									2,414,000	2,900,000	4,739,000
Total identifiable assets	683,580,000				388,894,000				683,580,000	388,894,000
Corporate and Other [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Revenues									67,691,000	46,532,000	39,122,000
Corporate and Other [Member] | Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Revenues									$ 4,452,000	$ 1,989,000	$ (133,000)