Other Current Liabilities - Additional Information (Detail)	3 Months Ended
Mar. 31, 2018
Maximum [Member]
Other Liabilities Disclosure [Line Items]
Performance obligation related to customer deposits expected satisfaction period	1 year

Performance obligation related to customer deposits expected satisfaction period.

No definition available.

Name:	ap_PerformanceObligationRelatedToCustomerDepositsExpectedSatisfactionPeriod
Namespace Prefix:	ap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration