Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity - Additional Information (Detail)

Shareholders' Equity - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Stockholders Equity [Line Items]  
Common stock reserved 8.7us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Effective income tax rate 35.00%atro_OtherComprehensiveIncomeLossEffectiveIncomeTaxRate
Income tax effect recorded for currency translation adjustments $ 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax
Convertible Class B Stock [Member]  
Stockholders Equity [Line Items]  
Class B stock voting rights per share 10 votes per share