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Investments in Joint Ventures - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2013
Dec. 24, 2014
Dec. 24, 2013
Dec. 24, 2012
Dec. 31, 2014
Dec. 31, 2012
Schedule of Investments [Line Items]              
Joint venture recognized impairment charge $ 6,407,000us-gaap_ImpairmentOfInvestments $ 6,407,000us-gaap_ImpairmentOfInvestments          
Carrying value investment 3,670,000us-gaap_EquityMethodInvestments 3,670,000us-gaap_EquityMethodInvestments       2,574,000us-gaap_EquityMethodInvestments  
Chinese Cast Roll Joint Venture [Member]              
Schedule of Investments [Line Items]              
Percentage of ownership in Chinese cast roll joint venture           25.00%ap_CostMethodInvestmentsOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ap_ChineseCastRollJointVentureMember
 
Recorded cost in Chinese cast roll joint venture           1,340,000us-gaap_CostMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ap_ChineseCastRollJointVentureMember
 
UES [Member]              
Schedule of Investments [Line Items]              
Percentage of ownership in joint venture           49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ap_UesMember
 
Cash payment for joint venture           14,700,000us-gaap_PaymentsToAcquireInterestInJointVenture
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ap_UesMember
 
Losses of the joint venture approximated   (4,203,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ap_UesMember
      (2,165,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ap_UesMember
(3,254,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ap_UesMember
Percentage of intercompany profit           49.00%ap_EquityMethodInvestmentUnrealizedIntercompanyProfitLossEliminatedPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ap_UesMember
 
Dividend declared     $ 0us-gaap_ProceedsFromDividendsReceived
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ap_UesMember
$ 0us-gaap_ProceedsFromDividendsReceived
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ap_UesMember
$ 0us-gaap_ProceedsFromDividendsReceived
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ap_UesMember
   
Maanshan [Member]              
Schedule of Investments [Line Items]              
Percentage of ownership in joint venture           51.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= ap_MaanshanMember