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Goodwill and Intangibles - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
APi Acquisition [Member] |  |  |  |
Goodwill [LineItems] |  |  |  |
Adjustment of cumulative amortization expense reversed | $ 5 | $ 5 | $ 15 | $ 5

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- Definition Adjustment of cumulative amortization expense reversed. + References No definition available. + Details
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Namespace Prefix: | apg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=apg_ApiAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |