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Income Taxes - Difference Between Statutory U.S. Federal Income Tax and the Corporation's Effective Income Tax (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Computed at statutory rate $ (312)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 9,513us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 5,309us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax differential on non-U.S. earnings 128us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (340)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (119)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
State income taxes (227)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 741us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 619us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Manufacturers deduction (I.R.C. Section 199) (359)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities (566)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities (257)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Meals and entertainment 224us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment 205us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment 198us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment
Tax credits (12)us-gaap_IncomeTaxReconciliationTaxCredits (145)us-gaap_IncomeTaxReconciliationTaxCredits (64)us-gaap_IncomeTaxReconciliationTaxCredits
Chinese joint venture (371)ap_IncomeTaxReconciliationJointVenture (3,125)ap_IncomeTaxReconciliationJointVenture (558)ap_IncomeTaxReconciliationJointVenture
Reversal of valuation allowance (33)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (156)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance (132)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Change in tax rates 301us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate (472)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate (143)us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Change in uncertain tax positions (80)us-gaap_IncomeTaxReconciliationTaxContingencies (172)us-gaap_IncomeTaxReconciliationTaxContingencies 87us-gaap_IncomeTaxReconciliationTaxContingencies
Other - net (25)us-gaap_IncomeTaxReconciliationOtherAdjustments 330us-gaap_IncomeTaxReconciliationOtherAdjustments 278us-gaap_IncomeTaxReconciliationOtherAdjustments
Total provision (benefit) for taxes on income $ (766)us-gaap_IncomeTaxExpenseBenefit $ 5,813us-gaap_IncomeTaxExpenseBenefit $ 5,218us-gaap_IncomeTaxExpenseBenefit