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Subsequent Event (Purchase of Atlantic Projects Company Limited) - Additional Information (Detail) (Subsequent Event [Member], Atlantic Projects Company Limited [Member], USD $) | 0 Months Ended |
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May 29, 2015 | May 29, 2015 Continents
Subsequent Event [Line Items] |  |
Acquisition date | May 29, 2015 |
Percentage of capital stock acquired | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Acquisition related Share Purchase Agreement date | May 11, 2015 |
Number of continents in which entity operates | 6 agx_NumberOfContinents | 6 agx_NumberOfContinents
Acquisition, purchase price Consideration | $ 10,807,000 us-gaap_BusinessCombinationConsiderationTransferred1 |
Acquisition, cash Consideration | $ 7,565,000 us-gaap_PaymentsToAcquireBusinessesGross |
Minimum [Member] |  |
Subsequent Event [Line Items] |  |
Number of countries in which entity operates | 30 us-gaap_NumberOfCountriesInWhichEntityOperates / us-gaap_BusinessAcquisitionAxis = agx_AtlanticProjectsCompanyLimitedMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 30 us-gaap_NumberOfCountriesInWhichEntityOperates / us-gaap_BusinessAcquisitionAxis = agx_AtlanticProjectsCompanyLimitedMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Common Stock [Member] |  |
Subsequent Event [Line Items] |  |
Acquisition, number of shares Consideration | 99,000 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = agx_AtlanticProjectsCompanyLimitedMember / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_CommonStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |

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