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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

X

- Definition

Adjustment of cumulative amortization expense reversed.

+ References

No definition available.

+ Details

Name:	apg_AdjustmentOfCumulativeAmortizationExpenseReversed
Namespace Prefix:	apg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

X

- Details

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