Segment Information, Geographical Data and Major Customers (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Vessel revenues		$ 139,361	$ 264,131	$ 301,791	$ 562,444
Other operating revenues		4,361	7,792	9,856	14,253
Total revenues		143,722	271,923	311,647	576,697
Operating profit (loss)		(21,432)	25,084	(45,101)	58,288
General and administrative expenses		(32,954)	(37,286)	(70,001)	(81,239)
Depreciation and amortization		43,845	45,979	88,397	91,636
Corporate expenses		(10,603)	(9,581)	(21,826)	(21,089)
Gain on asset dispositions, net		6,253	6,111	11,896	13,462
Asset impairments	[1]	(129,562)	(31,672)	(166,448)	(46,630)
Restructuring charge	[2]		(7,586)		(7,586)
Operating loss		(155,344)	(17,644)	(221,479)	(3,555)
Foreign exchange gain (loss)		(2,539)	844	(5,272)	(3,289)
Equity in net earnings (losses) of unconsolidated companies		1,313	(2,919)	1,312	(5,360)
Interest income and other, net		992	355	2,168	1,145
Interest and other debt costs, net		(18,477)	(13,247)	(35,431)	(26,429)
Loss before income taxes		(174,055)	(32,611)	(258,702)	(37,488)
Additions to properties and equipment		9,871	47,442	19,986	140,461
All Other Segments
Segment Reporting Information [Line Items]
Operating profit (loss)		(1,012)	(658)	(1,439)	(2,494)
Depreciation and amortization		1,339	1,502	2,720	2,916
Additions to properties and equipment			86		86
Operating Segments
Segment Reporting Information [Line Items]
Operating profit (loss)		(20,420)	25,742	(43,662)	60,782
Depreciation and amortization		41,909	42,828	84,350	85,577
Additions to properties and equipment		426	22,526	848	45,780
Operating Segments | Americas
Segment Reporting Information [Line Items]
Vessel revenues		53,125	89,210	113,733	203,382
Operating profit (loss)		(1,177)	8,812	(5,503)	32,651
Depreciation and amortization		12,700	12,232	25,478	24,282
Additions to properties and equipment			20,000	75	42,054
Operating Segments | Asia/Pacific
Segment Reporting Information [Line Items]
Vessel revenues		6,110	32,173	14,031	60,110
Operating profit (loss)		(6,096)	6,168	(11,670)	7,918
Depreciation and amortization		5,538	5,311	11,320	10,700
Additions to properties and equipment			1,075		1,710
Operating Segments | Middle East
Segment Reporting Information [Line Items]
Vessel revenues		23,474	28,684	47,676	60,937
Operating profit (loss)		925	244	892	4,248
Depreciation and amortization		5,241	4,802	10,353	9,601
Additions to properties and equipment		34	357	314	649
Operating Segments | Africa/Europe
Segment Reporting Information [Line Items]
Vessel revenues		56,652	114,064	126,351	238,015
Operating profit (loss)		(14,072)	10,518	(27,381)	15,965
Depreciation and amortization		18,430	20,483	37,199	40,994
Additions to properties and equipment		392	1,094	459	1,367
Corporate
Segment Reporting Information [Line Items]
General and administrative expenses		(10,006)	(7,932)	(20,499)	(17,946)
Depreciation and amortization		597	1,649	1,327	3,143
Additions to properties and equipment	[3]	$ 9,445	$ 24,830	$ 19,138	$ 94,595

[1] Refer to Note (15) for additional information regarding asset impairment charges.

[2] Refer to Note (14) for additional information regarding the restructuring charge.

[3] 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.