Gulf Island Fabrication, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Contract Costs - Additional Information (Detail)

Contract Costs - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014 Project	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013 Project	Dec. 31, 2013
Long-term Contracts or Programs Disclosure [Line Items]
Pass-through costs as a percentage of revenue	42.60%	59.40%	47.80%	57.10%
Costs and estimated earnings in excess of billings on uncompleted contracts, unbilled costs	$ 21,803,000		$ 21,803,000		$ 24,727,000
Billings in excess of costs and estimated earnings, advances	19,820,000		19,820,000		35,006,000
Loss recorded for marine projects	300,000		5,100,000
Total revenue recorded in relation to orders change in projects	300,000			3,900,000
Number of projects orders changed	1			2
Unbilled Contract Costs [Member]
Long-term Contracts or Programs Disclosure [Line Items]
Costs and estimated earnings in excess of billings on uncompleted contracts, unbilled costs	9,300,000		9,300,000
Number of major customers			3
Contract Advances [Member]
Long-term Contracts or Programs Disclosure [Line Items]
Number of major customers			3
Billings in excess of costs and estimated earnings, advances	$ 14,200,000		$ 14,200,000

- Definition

Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

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