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Divestitures and Held for Sale - Summary of Long Lived Assets Held-for-sale (Parenthetical) (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2020 USD ($)
Property Plant And Equipment Assets Held For Sale Disclosure [Abstract] |
Impairment charge to goodwill at business divested prior to current period | $ 4

X
- Definition Goodwill impairment loss at business divested prior to current period. + References No definition available. + Details
Name: | apg_GoodwillImpairmentLossAtBusinessDivestedPriorToCurrentPeriod
Namespace Prefix: | apg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAssetsHeldForSaleDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration