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Litigation - Summary of Activity Relating to Asbestos Liability (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Asbestos liability, beginning of the year	$ 207,092	$ 238,679
Settlement and defense costs paid	(20,859)	(18,610)
Asbestos liability, end of the period	$ 186,233	$ 220,069

X

- Definition

Loss contingency settlement and defense costs paid.

+ References

No definition available.

+ Details

Name:	ap_LossContingencySettlementAndDefenseCostsPaid
Namespace Prefix:	ap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-10

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