Property, Plant and Equipment - Additional Information (Detail) - Sep. 30, 2016 £ in Thousands, $ in Thousands	USD ($)	GBP (£)
Property, Plant and Equipment [Abstract]
Land and Building	$ 2,687	£ 2,072

The cost of land and buildings as of the reporting date that are held as collateral for outstanding obligations as of the reporting date.

No definition available.

Name:	ap_LandAndBuildingsHeldAsCollateral
Namespace Prefix:	ap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant