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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (111)us-gaap_NetIncomeLoss | [1],[2] | $ 7,586 us-gaap_NetIncomeLoss | [1] | $ 4,310 us-gaap_NetIncomeLoss | [1] | $ 3,535 us-gaap_NetIncomeLoss | $ (3,110)us-gaap_NetIncomeLoss | [1] | $ 3,276 us-gaap_NetIncomeLoss | [1] | $ 4,279 us-gaap_NetIncomeLoss | [1] | $ 2,787 us-gaap_NetIncomeLoss | $ 15,320 us-gaap_NetIncomeLoss | $ 7,232 us-gaap_NetIncomeLoss | $ (4,091)us-gaap_NetIncomeLoss
Less: Distributed loss / distributed and undistributed income (unvested restricted stock) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 104 gifi_NetIncomeLossAllocatedToParticipatingSecuritiesBasic | 75 gifi_NetIncomeLossAllocatedToParticipatingSecuritiesBasic | 46 gifi_NetIncomeLossAllocatedToParticipatingSecuritiesBasic
Net income (loss) attributable to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,216 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 7,157 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (4,137)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator for basic earnings per share-weighted-average shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,505 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 14,462 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 14,501 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per share-common shareholders | $ (0.01)us-gaap_EarningsPerShareBasic | [1],[2] | $ 0.52 us-gaap_EarningsPerShareBasic | [1] | $ 0.30 us-gaap_EarningsPerShareBasic | [1] | $ 0.24 us-gaap_EarningsPerShareBasic | $ (0.22)us-gaap_EarningsPerShareBasic | [1] | $ 0.23 us-gaap_EarningsPerShareBasic | [1] | $ 0.30 us-gaap_EarningsPerShareBasic | [1] | $ 0.19 us-gaap_EarningsPerShareBasic | $ 1.05 us-gaap_EarningsPerShareBasic | $ 0.50 us-gaap_EarningsPerShareBasic | $ (0.29)us-gaap_EarningsPerShareBasic
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | (111)us-gaap_NetIncomeLoss | [1],[2] | 7,586 us-gaap_NetIncomeLoss | [1] | 4,310 us-gaap_NetIncomeLoss | [1] | 3,535 us-gaap_NetIncomeLoss | (3,110)us-gaap_NetIncomeLoss | [1] | 3,276 us-gaap_NetIncomeLoss | [1] | 4,279 us-gaap_NetIncomeLoss | [1] | 2,787 us-gaap_NetIncomeLoss | 15,320 us-gaap_NetIncomeLoss | 7,232 us-gaap_NetIncomeLoss | (4,091)us-gaap_NetIncomeLoss
Less: Distributed loss / distributed and undistributed income (unvested restricted stock) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 104 gifi_NetIncomeLossAllocatedToParticipatingSecuritiesDiluted | 75 gifi_NetIncomeLossAllocatedToParticipatingSecuritiesDiluted | 46 gifi_NetIncomeLossAllocatedToParticipatingSecuritiesDiluted
Net income attributable to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,216 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 7,157 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ (4,137)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Denominator for basic earnings per share-weighted-average shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,505 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 14,462 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 14,501 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment |
Denominator for dilutive earnings per share-weighted-average shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,505 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 14,468 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 14,501 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per share-common shareholders | $ (0.01)us-gaap_EarningsPerShareDiluted | [1],[2] | $ 0.52 us-gaap_EarningsPerShareDiluted | [1] | $ 0.30 us-gaap_EarningsPerShareDiluted | [1] | $ 0.24 us-gaap_EarningsPerShareDiluted | $ (0.22)us-gaap_EarningsPerShareDiluted | [1] | $ 0.23 us-gaap_EarningsPerShareDiluted | [1] | $ 0.30 us-gaap_EarningsPerShareDiluted | [1] | $ 0.19 us-gaap_EarningsPerShareDiluted | $ 1.05 us-gaap_EarningsPerShareDiluted | $ 0.50 us-gaap_EarningsPerShareDiluted | $ (0.29)us-gaap_EarningsPerShareDiluted
[1] | We recognized contract losses of $1.6 million for the three-month period ended December 31, 2014, $0.3 million for the three-month period ended September 30, 2014, and $4.7 million for the three-month period ended June 30, 2014. We recognized contract losses of $18.2 million in the three-month period ended December 31, 2013, $10.9 million in the three-month period ended September 30, 2013, and $0.6 million in the three-month period ended June 30, 2013, as required under the accounting for loss contracts under percentage of completion accounting. Contract losses for the year ended December 31, 2014 were primarily related to tank barge projects for a marine transportation company, platform supply vessels for an offshore marine company and a production platform jacket for a deepwater customer. Contract losses in 2013 were primarily due to the impact of the de-scoping and final close-out of one of our major deepwater projects, as further discussed in the Note 1 under "Revenue Recognition" above.
[2] | We recognized an impairment charge of $3.2 million related to a reduction in the fair value of assets held for sale and a $3.6 million charge related to an increase in the allowance for doubtful accounts for negotiations of an outstanding contract receivable balance for the three-month period ended December 31, 2014.

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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