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v3.19.1

SIGNIFICANT ACCOUNTING POLICIES (Schedule of Original Useful Lives of Intangible Assets) (Details) | 12 Months Ended
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Dec. 31, 2018
Computer Software Intangible Asset [Member] | Minimum [Member] |
Finite-Lived Intangible Assets [Line Items] |
Original estimated useful lives | 2 years
Computer Software Intangible Asset [Member] | Maximum [Member] |
Finite-Lived Intangible Assets [Line Items] |
Original estimated useful lives | 10 years
Student Populations [Member] | Minimum [Member] |
Finite-Lived Intangible Assets [Line Items] |
Original estimated useful lives | 1 year 9 months 18 days
Student Populations [Member] | Maximum [Member] |
Finite-Lived Intangible Assets [Line Items] |
Original estimated useful lives | 15 years
Cooperative Agreement [Member] | Minimum [Member] |
Finite-Lived Intangible Assets [Line Items] |
Original estimated useful lives | 1 year 3 months 18 days
Cooperative Agreement [Member] | Maximum [Member] |
Finite-Lived Intangible Assets [Line Items] |
Original estimated useful lives | 10 years
Off-Market Favorable Lease [Member] | Minimum [Member] |
Finite-Lived Intangible Assets [Line Items] |
Original estimated useful lives | 9 months 18 days
Off-Market Favorable Lease [Member] | Maximum [Member] |
Finite-Lived Intangible Assets [Line Items] |
Original estimated useful lives | 20 years
Trademarks and Trade Names [Member] |
Finite-Lived Intangible Assets [Line Items] |
Finite Lived Intangible Asset Estimated Useful Lives | Indefinite
Brands [Member] |
Finite-Lived Intangible Assets [Line Items] |
Finite Lived Intangible Asset Estimated Useful Lives | Indefinite

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- Definition Describes the periods of time over which an entity anticipates to receive utility from its finite lived intangible asset (that is, the periods of time over which an entity allocates the initial cost of its finite lived intangible asset). + References No definition available. + Details
Name: | amboy_FiniteLivedIntangibleAssetEstimatedUsefulLives
Namespace Prefix: | amboy_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_ComputerSoftwareIntangibleAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=amboy_StudentPopulationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=amboy_CooperativeAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_OffMarketFavorableLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksAndTradeNamesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=amboy_BrandsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |