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Costs, Estimated Earnings and Billings on Uncompleted Contracts - Aggregate Amount of Costs Incurred and Earnings Accrued on Uncompleted Contracts Compared with Billings on Contracts (Detail) (USD $)
Apr. 30, 2015
Jan. 31, 2015
Contractors [Abstract]    
Costs incurred on uncompleted contracts $ 395,208,000agx_CostsIncurredOnUncompletedContracts $ 324,839,000agx_CostsIncurredOnUncompletedContracts
Estimated accrued earnings 75,776,000agx_EstimatedAccruedEarnings 60,809,000agx_EstimatedAccruedEarnings
Contracts Receivables, Gross 470,984,000agx_UncompletedContractsRevenue 385,648,000agx_UncompletedContractsRevenue
Less - Billings to date 633,362,000agx_BillingsContractTillDate 546,757,000agx_BillingsContractTillDate
Billings in excess of costs and estimated earnings on uncompleted contracts, net (162,378,000)agx_BillingsInExcessOfCostOnUncompletedContracts (161,109,000)agx_BillingsInExcessOfCostOnUncompletedContracts
Costs and estimated earnings in excess of billings 595,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms 455,000us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
Billings in excess of costs and estimated earnings 162,973,000us-gaap_BillingsInExcessOfCost 161,564,000us-gaap_BillingsInExcessOfCost
Billings in excess of costs and estimated earnings on uncompleted contracts, net $ (162,378,000)agx_BillingsInExcessOfCostOnUncompletedContracts $ (161,109,000)agx_BillingsInExcessOfCostOnUncompletedContracts