Property, Plant and Equipment - Additional Information (Detail) In Thousands, unless otherwise specified	Dec. 31, 2014 USD ($)	Dec. 31, 2014 GBP (£)
Property, Plant and Equipment [Abstract]
Land and Building	$ 3,150ap_LandAndBuildingsHeldAsCollateral	£ 2,022ap_LandAndBuildingsHeldAsCollateral

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