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Contracts Receivable and Retainage - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 Customer | Dec. 31, 2013
Long-term Contracts or Programs Disclosure [Line Items] |  |  |
Contract receivable | $ 80,448,000 us-gaap_ContractReceivableDueOneYearOrLess | $ 80,448,000 us-gaap_ContractReceivableDueOneYearOrLess | $ 98,579,000 us-gaap_ContractReceivableDueOneYearOrLess
Allowance for bad debt | 3,603,000 us-gaap_AllowanceForDoubtfulAccountsReceivable | 3,603,000 us-gaap_AllowanceForDoubtfulAccountsReceivable | 887,000 us-gaap_AllowanceForDoubtfulAccountsReceivable
Amount of reserved contract receivable | 600,000 us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries |  |
Top 3 Customer [Member] |  |  |
Long-term Contracts or Programs Disclosure [Line Items] |  |  |
Contract receivable | $ 47,100,000 us-gaap_ContractReceivableDueOneYearOrLess / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = gifi_TopThreeCustomerMember | $ 47,100,000 us-gaap_ContractReceivableDueOneYearOrLess / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = gifi_TopThreeCustomerMember |
Number of major customers account for 61.6% of contract receivable |  | 3 gifi_NumberOfMajorCustomerRevenue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = gifi_TopThreeCustomerMember |
Percentage of contract receivable |  | 58.50%gifi_PercentageOfRevenueFromMajorCustomer / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = gifi_TopThreeCustomerMember |

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- Definition Number Of Major Customer Revenue + References No definition available. + Details
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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of recoveries of receivables doubtful of collection that were previously charged off. + References No definition available. + Details
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- Definition Amount billed to customers under long-term contracts or programs to be collected in the next fiscal year following the latest fiscal year. Excludes amounts due that have been withheld because of retainage provisions in a contract. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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