Debtor's Condensed Combined Statements of Earnings (Loss) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2017	Jun. 30, 2016
Revenues:
Vessel revenues		$ 112,257	$ 162,430
Other operating revenues		2,849	5,495
Total revenues		115,106	167,925
Costs and expenses:
Vessel operating costs		83,773	108,874
Costs of other operating revenues		1,585	3,903
General and administrative		33,059	37,047
Vessel operating leases		5,542	8,441
Depreciation and amortization		36,287	44,552
Gain on asset dispositions, net		(3,189)	(5,643)
Asset impairments	[1]	163,423	36,886
Total costs and expenses		320,480	234,060
Operating loss		(205,374)	(66,135)
Other income (expenses):
Foreign exchange loss		(1,157)	(2,733)
Reorganization items	[2]	(313,176)
Interest and other debt costs, net		(10,605)	(16,954)
Total other income (expenses)		(318,741)	(18,512)
Loss before income taxes		(524,115)	(84,647)
Income tax expense (benefit)		295	3,996
Net loss		(524,410)	$ (88,643)
Debtor's
Revenues:
Vessel revenues		16,518
Other operating revenues		621
Total revenues		17,139
Costs and expenses:
Vessel operating costs		5,557
Costs of other operating revenues		71
General and administrative		17,131
Vessel operating leases		3,111
Depreciation and amortization		10,798
Gain on asset dispositions, net		(3,011)
Asset impairments		65,715
Total costs and expenses		99,372
Operating loss		(82,233)
Other income (expenses):
Foreign exchange loss		(70)
Reorganization items		(313,176)
Interest and other debt costs, net		(5,949)
Total other income (expenses)		(319,195)
Loss before income taxes		(401,428)
Income tax expense (benefit)		(6,832)
Net loss		$ (394,596)

[1] Refer to Note (16) for additional information regarding asset impairment charges.

[2] Refer to Note (4) for additional information regarding reorganization items.