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Special Purpose Entities - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2015 | Apr. 30, 2015 Project JointVenture | Apr. 30, 2015 | Aug. 31, 2014 MW
Variable Interest Entity [Line Items] |  |  |  |
Number of natural gas-fired power plants |  | 2 us-gaap_VariableInterestEntityNumberOfEntitiesWithUnavailabilityOfInformation |  |
Number of joint ventures |  | 2 agx_NumberOfJointVentureUnderContractWithCompany | 2 agx_NumberOfJointVentureUnderContractWithCompany |
Cash distributions to joint venture partner | $ 25,000,000 us-gaap_PaymentsOfDistributionsToAffiliates |  |  |
Moxie Freedom LLC [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Nominal capacity of natural gas-fired power plant |  |  |  | 1,000 agx_CapacityOfNaturalGasFiredPowerPlant / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = agx_MoxieFreedomLlcMember
Interest rate on loan receivable |  |  | 20.00%agx_ReceivableInterestRateStatedPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = agx_MoxieFreedomLlcMember |
Notes receivable and accrued interest |  | 2,830,000 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = agx_MoxieFreedomLlcMember | 2,830,000 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = agx_MoxieFreedomLlcMember |
Maturity date of loan |  | Dec. 31, 2017 |  |
Project development support costs included in accrued expenses | 275,000 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = agx_MoxieFreedomLlcMember | 262,000 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = agx_MoxieFreedomLlcMember | 262,000 us-gaap_AccruedLiabilitiesCurrentAndNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = agx_MoxieFreedomLlcMember |
Development success fee |  | 6,000,000 agx_DevelopmentSuccessFeesContingentRevenue / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = agx_MoxieFreedomLlcMember |  |
Loan approved percentage |  | 40.00%agx_VariableInterestEntityDevelopmentLoanFundingPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = agx_MoxieFreedomLlcMember |  |
Cash received pursuant to participation agreement |  | 1,042,000 agx_CashReceivedOnBehalfOfSubsidiariesAndVariableInterestEntity / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = agx_MoxieFreedomLlcMember |  |
Percentage of development success fee to be shared with equipment seller, not yet earned |  | 40.00%agx_PercentageOfDevelopmentSuccessFeeToBeSharedWithEquipmentSellerNotYetEarned / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = agx_MoxieFreedomLlcMember |  |
Interest rate on cash received |  | 20.00%agx_InterestRateOnCashReceived / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = agx_MoxieFreedomLlcMember |  |
Moxie Freedom LLC [Member] | Maximum [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Development loans to Moxie Freedom |  |  |  | 6,000,000 us-gaap_VariableInterestEntityFinancialOrOtherSupportAmount / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = agx_MoxieFreedomLlcMember

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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