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Revenues from Major Customers - Revenues from Major Customers (Detail) (USD $) | 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
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from major customers | $ 124,760,000 us-gaap_Revenues | [1],[2] | $ 118,020,000 us-gaap_Revenues | [1] | $ 129,169,000 us-gaap_Revenues | [1] | $ 134,690,000 us-gaap_Revenues | $ 135,138,000 us-gaap_Revenues | [1] | $ 168,191,000 us-gaap_Revenues | [1] | $ 154,575,000 us-gaap_Revenues | [1] | $ 150,422,000 us-gaap_Revenues | $ 506,639,000 us-gaap_Revenues | $ 608,326,000 us-gaap_Revenues | $ 521,340,000 us-gaap_Revenues
Williams Field Services-Gulf Coast Company L. P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from major customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 216,875 us-gaap_Revenues / us-gaap_MajorCustomersAxis = gifi_CustomerTwoMember | 124,841 us-gaap_Revenues / us-gaap_MajorCustomersAxis = gifi_CustomerTwoMember
Chevron Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from major customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 148,539 us-gaap_Revenues / us-gaap_MajorCustomersAxis = gifi_CustomerOneMember | 192,370 us-gaap_Revenues / us-gaap_MajorCustomersAxis = gifi_CustomerOneMember
Walter Oil & Gas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from major customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160,173 us-gaap_Revenues / us-gaap_MajorCustomersAxis = gifi_WalterOilAndGasMember |  |
Anadarko [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from major customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 98,644 us-gaap_Revenues / us-gaap_MajorCustomersAxis = gifi_AnadarkoMember |  |
[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 Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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