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USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 5 ASSETS 3 us-gaap_AssetsAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false xbrli:stringItemType string No definition available. false 6 Allowance for doubtful accounts, accounts receivable 4 us-gaap_AllowanceForDoubtfulAccountsReceivable 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 11260000 11260 true false false 2 true true false false 11715000 11715 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 true true false false 11260000 11260 true false false 12 true true false false 11715000 11715 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false xbrli:monetaryItemType monetary For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 false 7 Stockholders' equity: 3 us-gaap_StockholdersEquityAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false xbrli:stringItemType string No definition available. false 8 Preferred stock, cumulative, redeemable, par value 4 us-gaap_PreferredStockParOrStatedValuePerShare us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel true 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 true true false false 0.01 0.01 true false false 4 true true false false 0.01 0.01 true false false 5 true true false false 0.01 0.01 true false false 6 true true false false 0.01 0.01 true false false 7 true true false false 0.01 0.01 true false false 8 true true false false 0.01 0.01 true false false 9 true true false false 0.01 0.01 true false false 10 true true false false 0.01 0.01 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false us-types:perShareItemType decimal Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 false 9 Preferred stock, cumulative, redeemable, shares authorized 4 us-gaap_PreferredStockSharesAuthorized us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false true false false 2300000 2300000 true false false 4 false true false false 2300000 2300000 true false false 5 false true false false 2300000 2300000 true false false 6 false true false false 2300000 2300000 true false false 7 false true false false 3000000 3000000 true false false 8 false true false false 3000000 3000000 true false false 9 false true false false 2000000 2000000 true false false 10 false true false false 2000000 2000000 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false xbrli:sharesItemType shares The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 false 10 Preferred stock, cumulative, redeemable, shares issued 4 us-gaap_PreferredStockSharesIssued us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false true false false 2000000 2000000 true false false 4 false true false false 2000000 2000000 true false false 5 false true false false 2300000 2300000 true false false 6 false true false false 2300000 2300000 true false false 7 false true false false 3000000 3000000 true false false 8 false true false false 3000000 3000000 true false false 9 false true false false 2000000 2000000 true false false 10 false true false false 2000000 2000000 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false xbrli:sharesItemType shares Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 false 11 Preferred stock, cumulative, redeemable, shares outstanding 4 us-gaap_PreferredStockSharesOutstanding us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false true false false 2000000 2000000 true false false 4 false true false false 2000000 2000000 true false false 5 false true false false 2300000 2300000 true false false 6 false true false false 2300000 2300000 true false false 7 false true false false 3000000 3000000 true false false 8 false true false false 3000000 3000000 true false false 9 false true false false 2000000 2000000 true false false 10 false true false false 2000000 2000000 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false xbrli:sharesItemType shares Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 false 12 Preferred stock, cumulative, redeemable, liquidation preference 4 amb_PreferredStockCumulativeRedeemableLiquidationPreference amb false na instant Preferred stock, cumulative, redeemable, liquidation preference. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false true false false 50000000 50000 true false false 4 false true false false 50000000 50000 true false false 5 false true false false 57500000 57500 true false false 6 false true false false 57500000 57500 true false false 7 false true false false 75000000 75000 true false false 8 false true false false 75000000 75000 true false false 9 false true false false 50000000 50000 true false false 10 false true false false 50000000 50000 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false xbrli:monetaryItemType monetary Preferred stock, cumulative, redeemable, liquidation preference. No authoritative reference available. false 13 Common stock, par value 4 us-gaap_CommonStockParOrStatedValuePerShare us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel true 1 true true false false 0.01 0.01 true false false 2 true true false false 0.01 0.01 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false us-types:perShareItemType decimal Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 false 15 Common stock, shares issued 4 us-gaap_CommonStockSharesIssued us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 168279950 168279950 true false false 2 false true false false 149258376 149258376 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false xbrli:sharesItemType shares Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. 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May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Excludes common shares repurchased by the entity and held as Treasury shares. Shares outstanding equals shares issued minus shares held in treasury. Does not include common shares that have been repurchased. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 false 17 Partners' capital: 3 us-gaap_PartnersCapitalAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false xbrli:stringItemType string No definition available. false 18 General partner, units outstanding 4 us-gaap_GeneralPartnersCapitalAccountUnitsOutstanding us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false true false false 168050539 168050539 true false false 12 false true false false 149028965 149028965 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false xbrli:sharesItemType shares The outstanding shares of ownership, measured in units, of the general partner. The general partner is a partner of a publicly traded limited partnership or master limited partnership who has unlimited liability and manages the partnership. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 10 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 false 19 Preferred units issued 4 us-gaap_PreferredUnitsPreferredPartnersCapitalAccountUnitsIssued us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false true false false 2000000 2000000 true false false 14 false true false false 2000000 2000000 true false false 15 false true false false 2300000 2300000 true false false 16 false true false false 2300000 2300000 true false false 17 false true false false 3000000 3000000 true false false 18 false true false false 3000000 3000000 true false false 19 false true false false 2000000 2000000 true false false 20 false true false false 2000000 2000000 true false false xbrli:sharesItemType shares The number of preferred units issued. Preferred partners are partners with preferential rights and privileges in a publicly listed limited partnership or master limited partnership. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 10 false 20 Preferred units outstanding 4 us-gaap_PreferredUnitsPreferredPartnersCapitalAccountUnitsOutstanding us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 false true false false 2000000 2000000 true false false 14 false true false false 2000000 2000000 true false false 15 false true false false 2300000 2300000 true false false 16 false true false false 2300000 2300000 true false false 17 false true false false 3000000 3000000 true false false 18 false true false false 3000000 3000000 true false false 19 false true false false 2000000 2000000 true false false 20 false true false false 2000000 2000000 true false false xbrli:sharesItemType shares The number of preferred units outstanding. Preferred partners are partners with preferential rights and privileges in a publicly listed limited partnership or master limited partnership. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 10 false 21 Preferred units liquidation preference 4 amb_PreferredUnitsLiquidationPreference amb false na instant preferred units liquidation preference. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false false false false 0 0 true false false 12 false false false false 0 0 true false false 13 true true false false 50000000 50000 true false false 14 true true false false 50000000 50000 true false false 15 true true false false 57500000 57500 true false false 16 true true false false 57500000 57500 true false false 17 true true false false 75000000 75000 true false false 18 true true false false 75000000 75000 true false false 19 true true false false 50000000 50000 true false false 20 true true false false 50000000 50000 true false false xbrli:monetaryItemType monetary preferred units liquidation preference. No authoritative reference available. false 22 Limited partners, units outstanding 4 us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding us-gaap true na instant No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 true false false 2 false false false false 0 0 true false false 3 false false false false 0 0 true false false 4 false false false false 0 0 true false false 5 false false false false 0 0 true false false 6 false false false false 0 0 true false false 7 false false false false 0 0 true false false 8 false false false false 0 0 true false false 9 false false false false 0 0 true false false 10 false false false false 0 0 true false false 11 false true false false 2070657 2070657 true false false 12 false true false false 2119928 2119928 true false false 13 false false false false 0 0 true false false 14 false false false false 0 0 true false false 15 false false false false 0 0 true false false 16 false false false false 0 0 true false false 17 false false false false 0 0 true false false 18 false false false false 0 0 true false false 19 false false false false 0 0 true false false 20 false false false false 0 0 true false false xbrli:sharesItemType shares The number of limited partner units outstanding. The limited partners are partners of a publicly traded limited partnership or master limited partnership. Limited partners have limited liability and do not manage the partnership. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section F Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 10 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 false 20 18 false Thousands NoRounding NoRounding false true