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Divestitures and Held for Sale - Summary of Long Lived Assets Held-for-sale (Parenthetical) (Detail) $ in Millions	9 Months Ended
	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

X

- References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentAssetsHeldForSaleDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration