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SEGMENT INFORMATION (Details) (USD $)
3 Months Ended6 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Mar. 31, 2011
Segment Reporting Information [Line Items]     
Total segment gross revenue$ 330,992,000$ 312,559,000$ 652,097,000$ 604,797,000 
Total intrasegment gross revenue677,000507,000684,000819,000 
Total consolidated gross revenue330,992,000312,559,000652,097,000604,797,000 
Total earnings from unconsolidated affiliates, net of losses - equity method investments(4,037,000)4,716,0001,956,0004,014,000 
Total consolidated operating income9,595,00053,559,00046,000,00093,238,000 
Total depreciation and amortization25,431,00020,968,00048,139,00040,299,000 
Total identifiable assets2,700,418,000 2,700,418,000 2,675,354,000
Total investments in unconsolidated affiliates - equity method195,617,000 195,617,000 202,244,000
Construction in progress within property and equipment124,900,000 124,900,000 112,400,000
Europe [Member]
     
Segment Reporting Information [Line Items]     
Total segment gross revenue140,244,000117,243,000274,524,000218,764,000 
Total intrasegment gross revenue(23,000)352,000235,000522,000 
Total consolidated gross revenue140,221,000117,595,000274,759,000219,286,000 
Total earnings from unconsolidated affiliates, net of losses - equity method investments2,466,0002,789,0005,324,0004,740,000 
Total consolidated operating income23,586,00021,612,00046,835,00039,911,000 
Total depreciation and amortization8,015,0007,054,00015,922,00012,207,000 
Total identifiable assets848,354,000 848,354,000 856,448,000
Total investments in unconsolidated affiliates - equity method11,807,000 11,807,000 11,508,000
West Africa [Member]
     
Segment Reporting Information [Line Items]     
Total segment gross revenue64,041,00058,110,000118,548,000117,206,000 
Total intrasegment gross revenue0000 
Total consolidated gross revenue64,041,00058,110,000118,548,000117,206,000 
Total consolidated operating income16,120,00017,158,00027,351,00032,794,000 
Total depreciation and amortization3,244,0003,801,0006,514,0008,576,000 
Total identifiable assets385,831,000 385,831,000 354,154,000
North America [Member]
     
Segment Reporting Information [Line Items]     
Total segment gross revenue47,794,00055,246,00091,961,000108,009,000 
Total intrasegment gross revenue463,00035,000538,00083,000 
Total consolidated gross revenue48,257,00055,281,00092,499,000108,092,000 
Total consolidated operating income2,571,0008,904,0004,155,00014,212,000 
Total depreciation and amortization5,947,0002,737,0009,634,0005,445,000 
Total identifiable assets278,371,000 278,371,000 302,081,000
Australia [Member]
     
Segment Reporting Information [Line Items]     
Total segment gross revenue33,323,00037,364,00078,618,00072,655,000 
Total intrasegment gross revenue117,0000235,0000 
Total consolidated gross revenue33,440,00037,364,00078,853,00072,655,000 
Total consolidated operating income576,0006,094,0005,100,00014,046,000 
Total depreciation and amortization2,816,0002,704,0005,938,0005,357,000 
Total identifiable assets290,694,000 290,694,000 288,036,000
Other International [Member]
     
Segment Reporting Information [Line Items]     
Total segment gross revenue36,147,00036,295,00071,614,00069,114,000 
Total intrasegment gross revenue0000 
Total consolidated gross revenue36,147,00036,295,00071,614,00069,114,000 
Total earnings from unconsolidated affiliates, net of losses - equity method investments(6,510,000)1,927,000(3,375,000)(670,000) 
Total consolidated operating income2,089,00011,102,00013,999,00013,367,000 
Total depreciation and amortization4,070,0003,114,0008,033,0006,277,000 
Total identifiable assets619,074,000 619,074,000 602,243,000
Total investments in unconsolidated affiliates - equity method183,810,000 183,810,000 190,736,000
Corporate and Other [Member]
     
Segment Reporting Information [Line Items]     
Total segment gross revenue9,443,0008,301,00016,832,00019,049,000 
Total intrasegment gross revenue120,000120,000(324,000)214,000 
Total consolidated gross revenue9,563,0008,421,00016,508,00019,263,000 
Total earnings from unconsolidated affiliates, net of losses - equity method investments7,00007,000(56,000) 
Total consolidated operating income(33,736,000)(13,208,000)(51,245,000)(24,707,000) 
Total depreciation and amortization1,339,0001,558,0002,098,0002,437,000 
Total identifiable assets278,094,000 278,094,000 272,392,000
Intersegment Elimination [Member]
     
Segment Reporting Information [Line Items]     
Total consolidated gross revenue(677,000)(507,000)(684,000)(819,000) 
Gain Loss On Disposition Of Other Assets [Member]
     
Segment Reporting Information [Line Items]     
Total consolidated operating income$ (1,611,000)$ 1,897,000$ (195,000)$ 3,615,000