Annual report pursuant to Section 13 and 15(d)

Revenues from Major Customers - Revenues from Major Customers (Detail)

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Revenues from Major Customers - Revenues from Major Customers (Detail) (USD $)
 3 Months Ended 12 Months Ended
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 $ 124,760,000us-gaap_Revenues [1],[2] $ 118,020,000us-gaap_Revenues [1] $ 129,169,000us-gaap_Revenues [1] $ 134,690,000us-gaap_Revenues $ 135,138,000us-gaap_Revenues [1] $ 168,191,000us-gaap_Revenues [1] $ 154,575,000us-gaap_Revenues [1] $ 150,422,000us-gaap_Revenues $ 506,639,000us-gaap_Revenues $ 608,326,000us-gaap_Revenues $ 521,340,000us-gaap_Revenues
Williams Field Services-Gulf Coast Company L. P. [Member]                      
Revenue, Major Customer [Line Items]                      
Revenue from major customers                   216,875us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= gifi_CustomerTwoMember 		124,841us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= gifi_CustomerTwoMember
Chevron Corporation [Member]                      
Revenue, Major Customer [Line Items]                      
Revenue from major customers                   148,539us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= gifi_CustomerOneMember 		192,370us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= gifi_CustomerOneMember
Walter Oil & Gas [Member]                      
Revenue, Major Customer [Line Items]                      
Revenue from major customers                 160,173us-gaap_Revenues
/ us-gaap_MajorCustomersAxis
= gifi_WalterOilAndGasMember 		   
Anadarko [Member]                      
Revenue, Major Customer [Line Items]                      
Revenue from major customers                 $ 98,644us-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.