SEGMENT INFORMATION (Details) (USD $)	3 Months Ended			3 Months Ended						3 Months Ended					3 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013	Sep. 30, 2013 Subsequent Event [Member] FB Entities [Member]	Jun. 30, 2013 Gain Loss On Disposition Of Other Assets [Member]	Jun. 30, 2012 Gain Loss On Disposition Of Other Assets [Member]	Jun. 30, 2013 Corporate And Other [Member]	Jun. 30, 2012 Corporate And Other [Member]	Mar. 31, 2013 Corporate And Other [Member]	Jun. 30, 2013 Intersegment Elimination [Member]	Jun. 30, 2012 Intersegment Elimination [Member]	Jun. 30, 2013 Europe [Member]	Jun. 30, 2012 Europe [Member]	Mar. 31, 2013 Europe [Member]	Jun. 30, 2013 West Africa [Member]	Jun. 30, 2012 West Africa [Member]	Mar. 31, 2013 West Africa [Member]	Jun. 30, 2013 North America [Member]	Jun. 30, 2012 North America [Member]	Mar. 31, 2013 North America [Member]	Jun. 30, 2013 Australia [Member]	Jun. 30, 2012 Australia [Member]	Mar. 31, 2013 Australia [Member]	Jun. 30, 2013 Other International [Member]	Jun. 30, 2012 Other International [Member]	Mar. 31, 2013 Other International [Member]
Segment Reporting Information [Line Items]
Total segment gross revenue	$ 398,994,000	$ 362,608,000					$ 17,349,000	$ 7,510,000				$ 166,709,000	$ 153,957,000		$ 79,381,000	$ 70,454,000		$ 58,582,000	$ 52,710,000		$ 43,998,000	$ 44,502,000		$ 32,975,000	$ 33,475,000
Total intrasegment gross revenue	847,000	379,000					863,000	120,000				0	63,000		0	0		(16,000)	196,000		0	0		0	0
Total consolidated gross revenue	398,994,000	362,608,000					18,212,000	7,630,000		(847,000)	(379,000)	166,709,000	154,020,000		79,381,000	70,454,000		58,566,000	52,906,000		43,998,000	44,502,000		32,975,000	33,475,000
Total earnings from unconsolidated affiliates, net of losses - equity method investments	11,972,000	1,989,000										3,040,000	2,006,000					(8,000)	0					8,940,000	(17,000)
Total consolidated operating income	56,119,000	39,993,000			(1,721,000)	(5,315,000)	(11,279,000)	(13,070,000)				20,021,000	21,876,000		19,253,000	16,131,000		8,123,000	6,475,000		3,280,000	6,509,000		18,442,000	7,387,000
Total depreciation and amortization	22,819,000	21,372,000					653,000	884,000				7,248,000	7,564,000		3,260,000	3,142,000		6,139,000	3,266,000		1,889,000	2,483,000		3,630,000	4,033,000
Total identifiable assets	3,058,487,000		2,950,692,000				475,355,000		388,894,000			865,295,000		808,568,000	373,840,000		390,402,000	540,480,000		527,710,000	223,168,000		245,757,000	580,349,000		589,361,000
Total investments in unconsolidated affiliates - equity method	270,711,000		265,837,000									7,942,000		8,569,000				60,509,000		60,517,000				202,260,000		196,751,000
Construction in progress within property and equipment	311,400,000		222,800,000
Proceeds from Divestiture of Interest in Joint Venture				$ 112,000,000