XML 130 R49.htm IDEA: XBRL DOCUMENT v2.4.1.9
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Significant Accounting Policies [Line Items]      
Percentage of unrealized gains and losses used to determine market related value of plan asset 20.00%ap_PercentageOfUnrealizedGainsAndLossesUsedToDetermineMarketRelatedValueOfPlanAsset    
Moving average period to determine market value of plan assets 5 years    
Deferred income tax liability $ 0us-gaap_DeferredTaxLiabilities    
Weighted average diluted common shares outstanding 10,404,744us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,406,478us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 10,389,678us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Stock Option [Member]      
Schedule Of Significant Accounting Policies [Line Items]      
Weighted average outstanding stock options 1,242,545us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
781,325us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
671,977us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
Minimum [Member]      
Schedule Of Significant Accounting Policies [Line Items]      
Investments in joint ventures 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Defined benefit plan actuarial gain loss percentage 10.00%ap_DefinedBenefitPlanThresholdPercentageToRecordActuarialGainLossInNetPeriodicBenefitCost
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Minimum [Member] | Land Improvements [Member]      
Schedule Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, estimated useful life 15 years    
Minimum [Member] | Buildings [Member]      
Schedule Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, estimated useful life 25 years    
Minimum [Member] | Machinery and Equipment [Member]      
Schedule Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, estimated useful life 3 years    
Maximum [Member]      
Schedule Of Significant Accounting Policies [Line Items]      
Investments in joint ventures 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Defined benefit plan actuarial gain loss percentage 10.00%ap_DefinedBenefitPlanThresholdPercentageToRecordActuarialGainLossInNetPeriodicBenefitCost
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Maximum [Member] | Land Improvements [Member]      
Schedule Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, estimated useful life 20 years    
Maximum [Member] | Buildings [Member]      
Schedule Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, estimated useful life 50 years    
Maximum [Member] | Machinery and Equipment [Member]      
Schedule Of Significant Accounting Policies [Line Items]      
Property, plant and equipment, estimated useful life 25 years