Bargaining agreement beginning expiration year.

No definition available.

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- Definition

Bargaining agreement ending expiration year.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Bargaining agreement expiration year.

+ References

No definition available.

+ Details

Name:	ap_BargainingAgreementExpirationYear
Namespace Prefix:	ap_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ap_CommitmentsAndContingentLiabilitiesLineItems
Namespace Prefix:	ap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount expected to be repaid because stipulated covenants were not met.

+ References

No definition available.

+ Details

Name:	ap_ContingentLiabilityOnGovernmentGrants
Namespace Prefix:	ap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of collective bargaining agreements.

+ References

No definition available.

+ Details

Name:	ap_MultiemployerPlansCollectiveBargainingArrangementNumber
Namespace Prefix:	ap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of collective bargaining agreements expired.

+ References

No definition available.

+ Details

Name:	ap_NumberOfCollectiveBargainingAgreementsExpired
Namespace Prefix:	ap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of covered employees under collective bargaining agreements.

+ References

No definition available.

+ Details

Name:	ap_PercentageOfCoveredEmployeesUnderCollectiveBargainingAgreements
Namespace Prefix:	ap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Reimbursement received for qualifying expenditures.

+ References

No definition available.

+ Details

Name:	ap_ProceedFromGovernmentGrants
Namespace Prefix:	ap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage of employee participants subject to a collective bargaining arrangement to all participants in a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 80

-Section 50

-Paragraph 5

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947

+ Details

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Period Type:	instant

Commitments and Contingent Liabilities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014 USD ($) Agreement	Dec. 31, 2010 USD ($)	Dec. 31, 2010 GBP (£)	Dec. 31, 2014 Collective Bargaining Agreement One [Member]	Dec. 31, 2014 Collective Bargaining Agreement Two [Member]
Commitments And Contingent Liabilities [Line Items]
Outstanding standby and commercial letters of credit	$ 18,903,000
Government grants received		1,083,000ap_ProceedFromGovernmentGrants	680,000ap_ProceedFromGovernmentGrants
Recorded liability	$ 0
Percentage on employees covered by collective bargaining agreements	53.00%
Number of bargaining agreements	6
Number of expired agreements	1
Percentage of covered employees				18.00%	39.00%
Bargaining agreement expiration year	2012
Bargaining agreement beginning expiration year	2015-12
Bargaining agreement ending expiration year	2018-05