Segment Information, Geographical Data and Major Customers (Detail) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Vessel revenues		$ 162,430	$ 298,313
Other operating revenues		5,495	6,461
Total revenues		167,925	304,774
Operating profit (loss)		(23,669)	33,204
General and administrative expenses		(37,047)	(43,953)
Depreciation and amortization		44,552	45,657
Corporate expenses		(11,223)	(11,508)
Gain on asset dispositions, net		5,643	7,351
Asset impairments	[1]	(36,886)	(14,958)
Operating income (loss)		(66,135)	14,089
Foreign exchange gain (loss)		(2,733)	(4,133)
Equity in net losses of unconsolidated companies		(1)	(2,441)
Interest income and other, net		1,176	790
Interest and other debt costs, net		(16,954)	(13,182)
Loss before income taxes		(84,647)	(4,877)
Additions to properties and equipment		10,115	93,019
All Other Segments
Segment Reporting Information [Line Items]
Operating profit (loss)		(427)	(1,836)
Depreciation and amortization		1,381	1,414
Operating Segments
Segment Reporting Information [Line Items]
Operating profit (loss)		(23,242)	35,040
Depreciation and amortization		42,441	42,749
Additions to properties and equipment		422	23,254
Operating Segments | Americas
Segment Reporting Information [Line Items]
Vessel revenues		60,608	114,172
Operating profit (loss)		(4,326)	23,839
Depreciation and amortization		12,778	12,050
Additions to properties and equipment		75	22,054
Operating Segments | Asia/Pacific
Segment Reporting Information [Line Items]
Vessel revenues		7,921	27,937
Operating profit (loss)		(5,574)	1,750
Depreciation and amortization		5,782	5,389
Additions to properties and equipment			635
Operating Segments | Middle East
Segment Reporting Information [Line Items]
Vessel revenues		24,202	32,253
Operating profit (loss)		(33)	4,004
Depreciation and amortization		5,112	4,799
Additions to properties and equipment		280	292
Operating Segments | Africa/Europe
Segment Reporting Information [Line Items]
Vessel revenues		69,699	123,951
Operating profit (loss)		(13,309)	5,447
Depreciation and amortization		18,769	20,511
Additions to properties and equipment		67	273
Corporate
Segment Reporting Information [Line Items]
General and administrative expenses		(10,493)	(10,014)
Depreciation and amortization		730	1,494
Additions to properties and equipment	[2]	$ 9,693	$ 69,765

[1] Refer to Note (14) for additional information regarding asset impairment charges.

[2] Included in Corporate are additions to properties and equipment relating to vessels currently under construction which have not yet been assigned to a non-corporate reporting segment as of the dates presented.