Amounts Incurred and Amounts Expected to be Incurred in Future by Major Type of Cost and by Segment (Detail) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred		$ 35,727,000
Expected to be incurred		54,273,000
Total amounts incurred		90,000,000
Atlantic
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred	14,600,000	34,066,000
Expected to be incurred		20,934,000
Total amounts incurred		55,000,000
Atlantic | Impairments and write offs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred		14,163,000
Expected to be incurred		87,000
Total amounts incurred		14,250,000
Atlantic | Severance and other personnel-related costs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred		9,645,000
Expected to be incurred		2,397,000
Total amounts incurred		12,042,000
Atlantic | Morgan City environmental reserve
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred		5,925,000
Expected to be incurred
Total amounts incurred		5,925,000
Atlantic | Morgan City yard-related expenses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred		4,175,000
Expected to be incurred		11,032,000
Total amounts incurred		15,207,000
Atlantic | Other, including contingency
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred		158,000
Expected to be incurred		7,418,000
Total amounts incurred		7,576,000
Corporate segment related charges
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred		1,661,000
Expected to be incurred		33,339,000
Total amounts incurred	1,600,000	35,000,000
Corporate segment related charges | Severance and other personnel-related costs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred		1,661,000
Expected to be incurred
Total amounts incurred		1,661,000
Corporate segment related charges | Other, including contingency
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred
Expected to be incurred		839,000
Total amounts incurred		839,000
Corporate segment related charges | Reorganization
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Incurred
Expected to be incurred		32,500,000
Total amounts incurred		$ 32,500,000