Annual report pursuant to Section 13 and 15(d)

Contract Costs - Additional Information (Detail)

v2.4.1.9
Contract Costs - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Contractors [Abstract]      
Pass-through costs as a percentage of revenue 48.20%gifi_PassThroughCostsAsPercentOfRevenue 58.50%gifi_PassThroughCostsAsPercentOfRevenue 48.30%gifi_PassThroughCostsAsPercentOfRevenue
Prepaid subcontractor costs $ 0us-gaap_OtherPrepaidExpenseCurrent $ 0us-gaap_OtherPrepaidExpenseCurrent $ 33,100,000us-gaap_OtherPrepaidExpenseCurrent