SEGMENT INFORMATION (Details) (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2011
Segment Reporting Information [Line Items]
Total segment gross revenue	$ 331,335,000	$ 317,869,000	$ 983,432,000	$ 922,666,000
Total intrasegment gross revenue	391,000	1,011,000	1,075,000	1,830,000
Total consolidated gross revenue	331,335,000	317,869,000	983,432,000	922,666,000
Total earnings from unconsolidated affiliates, net of losses - equity method investments	3,101,000	5,341,000	5,057,000	9,355,000
Total consolidated operating income	43,553,000	46,639,000	89,553,000	139,877,000
Total depreciation and amortization	22,709,000	21,338,000	70,848,000	61,637,000
Total identifiable assets	2,766,017,000		2,766,017,000		2,675,354,000
Total investments in unconsolidated affiliates - equity method	194,025,000		194,025,000		202,244,000
Construction in progress within property and equipment	141,100,000		141,100,000		112,400,000
Gain Loss On Disposition Of Other Assets [Member]
Segment Reporting Information [Line Items]
Total consolidated operating income	(2,865,000)	(33,000)	(3,060,000)	3,582,000
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total segment gross revenue	10,291,000	5,545,000	27,123,000	24,594,000
Total intrasegment gross revenue	51,000	848,000	(273,000)	1,062,000
Total consolidated gross revenue	10,342,000	6,393,000	26,850,000	25,656,000
Total earnings from unconsolidated affiliates, net of losses - equity method investments	0	(3,000)	7,000	(59,000)
Total consolidated operating income	(9,930,000)	(15,444,000)	(61,175,000)	(40,151,000)
Total depreciation and amortization	1,358,000	1,458,000	3,456,000	3,895,000
Total identifiable assets	401,308,000		401,308,000		272,392,000
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Total consolidated gross revenue	(391,000)	(1,011,000)	(1,075,000)	(1,830,000)
Europe [Member]
Segment Reporting Information [Line Items]
Total segment gross revenue	134,442,000	129,705,000	408,966,000	348,469,000
Total intrasegment gross revenue	87,000	123,000	322,000	645,000
Total consolidated gross revenue	134,529,000	129,828,000	409,288,000	349,114,000
Total earnings from unconsolidated affiliates, net of losses - equity method investments	3,492,000	3,490,000	8,816,000	8,230,000
Total consolidated operating income	20,792,000	25,470,000	67,627,000	65,381,000
Total depreciation and amortization	7,667,000	7,182,000	23,589,000	19,389,000
Total identifiable assets	799,315,000		799,315,000		856,448,000
Total investments in unconsolidated affiliates - equity method	9,668,000		9,668,000		11,508,000
West Africa [Member]
Segment Reporting Information [Line Items]
Total segment gross revenue	69,867,000	53,725,000	188,415,000	170,931,000
Total intrasegment gross revenue	0	0	0	0
Total consolidated gross revenue	69,867,000	53,725,000	188,415,000	170,931,000
Total consolidated operating income	18,130,000	15,995,000	45,481,000	48,789,000
Total depreciation and amortization	3,155,000	2,615,000	9,669,000	8,060,000
Total identifiable assets	384,589,000		384,589,000		354,154,000
North America [Member]
Segment Reporting Information [Line Items]
Total segment gross revenue	42,718,000	45,589,000	134,679,000	153,598,000
Total intrasegment gross revenue	26,000	40,000	564,000	123,000
Total consolidated gross revenue	42,744,000	45,629,000	135,243,000	153,721,000
Total consolidated operating income	1,834,000	1,917,000	5,989,000	16,129,000
Total depreciation and amortization	3,150,000	3,751,000	12,784,000	12,327,000
Total identifiable assets	258,474,000		258,474,000		302,081,000
Australia [Member]
Segment Reporting Information [Line Items]
Total segment gross revenue	35,842,000	41,440,000	114,460,000	114,095,000
Total intrasegment gross revenue	227,000	0	462,000	0
Total consolidated gross revenue	36,069,000	41,440,000	114,922,000	114,095,000
Total consolidated operating income	3,139,000	7,139,000	8,239,000	21,185,000
Total depreciation and amortization	2,873,000	3,002,000	8,811,000	8,359,000
Total identifiable assets	309,659,000		309,659,000		288,036,000
Other International [Member]
Segment Reporting Information [Line Items]
Total segment gross revenue	38,175,000	41,865,000	109,789,000	110,979,000
Total intrasegment gross revenue	0	0	0	0
Total consolidated gross revenue	38,175,000	41,865,000	109,789,000	110,979,000
Total earnings from unconsolidated affiliates, net of losses - equity method investments	(391,000)	1,854,000	(3,766,000)	1,184,000
Total consolidated operating income	12,453,000	11,595,000	26,452,000	24,962,000
Total depreciation and amortization	4,506,000	3,330,000	12,539,000	9,607,000
Total identifiable assets	612,672,000		612,672,000		602,243,000
Total investments in unconsolidated affiliates - equity method	$ 184,357,000		$ 184,357,000		$ 190,736,000