2.2.0.7 false Income Taxes (Details) (USD $) 0612 - Disclosure - Income Taxes (Details) true false In Millions false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 3 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 4 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 5 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 6 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 7 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 8 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 3 Income Taxes (Textuals) 1 altr_IncomeTaxesTextualsAbstract altr false na duration Income Taxes. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false xbrli:stringItemType string Income Taxes. false 4 Effective tax rate 2 us-gaap_EffectiveIncomeTaxRateContinuingOperations us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 0.122 0.122 false false false 2 false true false false 0.296 0.296 false false false 3 false true false false 0.088 0.088 false false false 4 false true false false 0.245 0.245 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false us-types:percentItemType pure A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 47 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 false 5 Reversed liabilities for uncertain tax positions 2 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 true true false false 11700000 11.7 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false xbrli:monetaryItemType monetary The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(3) false 6 Reversed liabilities for uncertain tax positions due to the expiration of the statute of limitations for certain foreign jurisdictions 2 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 3400000 3.4 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false xbrli:monetaryItemType monetary The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a(4) false 7 Adjustment to income tax owed (excluding interest) after examination by IRS 2 us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false false false false 0 0 false false false 7 false true false false 34300000 34.3 false false false 8 false true false false 34500000 34.5 false false false xbrli:monetaryItemType monetary The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority. No authoritative reference available. false 8 Payment on bond for items associated with IRS field examination 2 us-gaap_IncomeTaxesPaid us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 18000000 18.0 false false false 6 false false false false 0 0 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false xbrli:monetaryItemType monetary The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 29 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 27 -Subparagraph f false 9 Unrecognized tax benefits 2 us-gaap_UnrecognizedTaxBenefits us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 243100000 243.1 false false false 2 false false false false 0 0 false false false 3 false true false false 243100000 243.1 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 false true false false 244100000 244.1 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false xbrli:monetaryItemType monetary The gross amount of unrecognized tax benefits (tax reductions recognized in financial reports but excluded from tax returns) pertaining to uncertain tax positions taken in tax returns as of the beginning balance sheet date, excluding amounts pertaining to examined tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -Subparagraph a false 10 Payments of interest and penalties related to uncertain tax positions (approximately) 2 us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued us-gaap true credit instant No definition available. false false false false false false false false false false false verboselabel false 1 true true false false 44000000 44.0 false false false 2 false false false false 0 0 false false false 3 true true false false 44000000 44.0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false 6 true true false false 47100000 47.1 false false false 7 false false false false 0 0 false false false 8 false false false false 0 0 false false false xbrli:monetaryItemType monetary The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. No authoritative reference available. false 8 8 false HundredThousands UnKnown UnKnown false true