Annual report pursuant to Section 13 and 15(d)

Line of Credit - Additional Information (Detail)

v2.4.1.9
Line of Credit - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Line of Credit Facility [Line Items]  
Revolving credit facility $ 80,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Revolving credit facility, maturity date Dec. 31, 2014
Revolving credit facility, extended maturity date Dec. 31, 2015
Revolving credit facility, interest rate above LIBOR 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Revolving credit facility, interest rate description Amounts borrowed under the Credit Facility bear interest, at our option, at either the prime lending rate established by JPMorgan Chase Bank, N.A. or LIBOR plus 1.5 percent.
Revolving credit facility, unused annual commitment fee 0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Revolving credit facility, amount outstanding 0gifi_LineOfCreditFacilityAmountBorrowed
Total outstanding letters of credit 21,000,000us-gaap_LettersOfCreditOutstandingAmount
Revolving credit facility, unused portion 59,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Line of credit covenant, debt to net worth 0.5gifi_DebtToNetWorthRatio
Line of credit covenant, Earnings before interest, taxes, depreciation and amortization (EBITDA) to interest expense ratio 4.0gifi_EarningsBeforeInterestTaxDepreciationAndAmortizationToInterestExpenseRatio
Line of credit covenant, minimum net worth required $ 254,100,000us-gaap_MinimumNetWorthRequiredForCompliance
Minimum [Member]  
Line of Credit Facility [Line Items]  
Line of credit covenant, current ratio 1.25gifi_CurrentRatio
/ us-gaap_RangeAxis
= us-gaap_MinimumMember