Segment Information, Geographical Data and Major Customers (Detail) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2015		Dec. 31, 2014
Segment Reporting Information [Line Items]
Vessel revenues		$ 212,908		$ 378,126	$ 775,352		$ 1,150,588
Other operating revenues		5,283		9,428	19,536		20,167
Total revenues		218,191		387,554	794,888		1,170,755
Operating profit (loss)		8,637		81,901	66,925		249,022
General and administrative expenses		(35,598)		(46,642)	(116,837)		(144,464)
Depreciation and amortization		45,422		43,331	137,058		130,150
Corporate expenses		(8,779)		(10,245)	(29,868)		(33,172)
Gain on asset dispositions, net		5,883		4,699	19,345		13,092
Asset impairments	[1]	(15,141)		(6,236)	(61,771)		(8,096)
Goodwill impairment				(283,699)			(283,699)	[2]
Restructuring charge			$ (7,586)		(7,586)	[3]
Operating loss		(9,400)		(213,580)	(12,955)		(62,853)
Foreign exchange gain (loss)		(469)		4,334	(3,758)		8,453
Equity in net earnings (losses) of unconsolidated companies		(1,710)			(7,070)		9,104
Interest income and other, net		609		434	1,754		1,555
Interest and other debt costs, net		(13,312)		(12,239)	(39,741)		(37,927)
Loss before income taxes		(24,282)		(221,051)	(61,770)		(81,668)
Additions to properties and equipment		11,909		103,055	152,370		235,254
Americas
Segment Reporting Information [Line Items]
Goodwill impairment							(114,237)
Sub-Saharan Africa/Europe
Segment Reporting Information [Line Items]
Goodwill impairment							(169,462)
All Other Segments
Segment Reporting Information [Line Items]
Operating profit (loss)		(626)		(1,032)	(3,120)		(5,548)
Depreciation and amortization		1,369		858	4,285		2,626
Additions to properties and equipment		26		10,206	113		18,931
Operating Segments
Segment Reporting Information [Line Items]
Operating profit (loss)		9,263		82,933	70,045		254,570
Depreciation and amortization		42,424		41,639	128,001		125,038
Additions to properties and equipment		3,011		78,651	48,790		148,645
Operating Segments | Americas
Segment Reporting Information [Line Items]
Vessel revenues		75,963		134,554	279,345		388,550
Operating profit (loss)		9,289		33,784	41,940		100,770
Depreciation and amortization		12,029		11,825	36,311		35,623
Additions to properties and equipment		2,064		32,421	44,118		64,057
Operating Segments | Asia/Pacific
Segment Reporting Information [Line Items]
Vessel revenues		19,144		35,046	79,254		121,284
Operating profit (loss)		(3,796)		2,621	4,122		9,064
Depreciation and amortization		5,803		4,731	16,503		13,538
Additions to properties and equipment		360		44,983	2,069		68,193
Operating Segments | Middle East/North Africa
Segment Reporting Information [Line Items]
Vessel revenues		40,184		55,925	132,786		160,301
Operating profit (loss)		5,849		12,408	21,524		31,568
Depreciation and amortization		6,992		7,016	21,103		20,383
Additions to properties and equipment		127		424	776		1,659
Operating Segments | Sub-Saharan Africa/Europe
Segment Reporting Information [Line Items]
Vessel revenues		77,617		152,601	283,967		480,453
Operating profit (loss)		(2,079)		34,120	2,459		113,168
Depreciation and amortization		17,600		18,067	54,084		55,494
Additions to properties and equipment		460		823	1,827		14,736
Corporate
Segment Reporting Information [Line Items]
General and administrative expenses		(7,150)		(9,411)	(25,096)		(30,686)
Depreciation and amortization		1,629		834	4,772		2,486
Additions to properties and equipment	[4]	$ 8,872		$ 14,198	$ 103,467		$ 67,678

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

[2] The total carrying amount of goodwill at March 31, 2014 is net of accumulated impairment charges $30.9 million and $56.3 million related to the Middle East/North Africa and Asia/Pacific segments, respectively

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

[4] 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.