Restructuring - Amounts Incurred and Amounts Expected to be Incurred in Future by Major Type of Cost and by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period	$ 6,346	$ 4,724	$ 32,126	$ 12,112
Incurred from inception to September 30, 2015	85,966		85,966
Estimate of remaining amounts to be incurred	14,704		14,704
Total	100,670		100,670
Americas Restructuring [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period	(27)	2,824	2,308	7,387
Incurred from inception to September 30, 2015	45,544		45,544
Total	45,544		45,544
Corporate Restructuring [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period		1,900		4,725
Incurred from inception to September 30, 2015	6,601		6,601
Total	6,601		6,601
MPI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period	6,373		29,818
Incurred from inception to September 30, 2015	33,821		33,821
Estimate of remaining amounts to be incurred	14,704		14,704
Total	48,525		48,525
Impairments and write offs [Member] | Americas Restructuring [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period		100		(1,240)
Incurred from inception to September 30, 2015	12,923		12,923
Total	12,923		12,923
Severance and other personnel-related costs [Member] | Americas Restructuring [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period		(155)	601	3,099
Incurred from inception to September 30, 2015	13,981		13,981
Total	13,981		13,981
Severance and other personnel-related costs [Member] | Corporate Restructuring [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period		53		961
Incurred from inception to September 30, 2015	2,599		2,599
Total	2,599		2,599
Morgan City yard-related expenses [Member] | Americas Restructuring [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period	(27)	2,879	1,707	5,528
Incurred from inception to September 30, 2015	12,557		12,557
Total	12,557		12,557
Other [Member] | Americas Restructuring [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred from inception to September 30, 2015	158		158
Total	158		158
Other [Member] | Corporate Restructuring [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period		730		730
Incurred from inception to September 30, 2015	798		798
Total	798		798
Legal and other advisor fees [Member] | Corporate Restructuring [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period		1,117		3,034
Incurred from inception to September 30, 2015	3,204		3,204
Total	3,204		3,204
Legal and other advisor fees [Member] | MPI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred from inception to September 30, 2015					$ 4,000
Morgan City environmental reserve [Member] | Americas Restructuring [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred from inception to September 30, 2015	5,925		5,925
Total	5,925		5,925
AEA [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period	2,333	2,824	8,719	7,387
Incurred from inception to September 30, 2015	51,955		51,955
Estimate of remaining amounts to be incurred	1,694		1,694
Total	53,649		53,649
AEA [Member] | Severance and other personnel-related costs [Member] | MPI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period	2,360		6,411
Incurred from inception to September 30, 2015	6,411		6,411
Estimate of remaining amounts to be incurred	1,694		1,694
Total	8,105		8,105
MEA [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period	71		982
Incurred from inception to September 30, 2015	982		982
Total	982		982
MEA [Member] | Severance and other personnel-related costs [Member] | MPI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period	71		982
Incurred from inception to September 30, 2015	982		982
Total	982		982
ASA [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period	387		14,971
Incurred from inception to September 30, 2015	14,971		14,971
Estimate of remaining amounts to be incurred	12,310		12,310
Total	27,281		27,281
ASA [Member] | Severance and other personnel-related costs [Member] | MPI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period	387		3,973
Incurred from inception to September 30, 2015	3,973		3,973
Estimate of remaining amounts to be incurred	5,200		5,200
Total	9,173		9,173
ASA [Member] | Other [Member] | MPI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period			3,527
Incurred from inception to September 30, 2015	3,527		3,527
Estimate of remaining amounts to be incurred	5,806		5,806
Total	9,333		9,333
ASA [Member] | Legal and other advisor fees [Member] | MPI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Estimate of remaining amounts to be incurred	1,304		1,304
Total	1,304		1,304
ASA [Member] | Asset impairment [Member] | MPI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period			7,471
Incurred from inception to September 30, 2015	7,471		7,471
Total	7,471		7,471
Corporate and Other [Member] | Severance and other personnel-related costs [Member] | MPI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period			1,119
Incurred from inception to September 30, 2015	1,119		1,119
Total	1,119		1,119
Corporate and Other [Member] | Other [Member] | MPI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Estimate of remaining amounts to be incurred	700		700
Total	700		700
Corporate [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period	3,555	$ 1,900	7,454	$ 4,725
Incurred from inception to September 30, 2015	18,058		18,058
Estimate of remaining amounts to be incurred	700		700
Total	18,758		18,758
Corporate [Member] | Legal and other advisor fees [Member] | MPI [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Incurred for the period	3,555		6,335
Incurred from inception to September 30, 2015	10,338		10,338
Total	$ 10,338		$ 10,338