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Stock Option and Purchase Plans - Additional Information (Detail) (USD $)
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12 Months Ended | |||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Period of options granted | 5 years | |||
| Share price | $ 55.31us-gaap_SharePrice | $ 42.50us-gaap_SharePrice | $ 15.89us-gaap_SharePrice | |
| The weighted average fair value of options vested | $ 8.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue | $ 5.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue | $ 5.15us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue | |
| Total fair value of options that vested during the year | $ 1,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue | $ 1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue | $ 1,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue | |
| Total compensation costs related to non-vested awards | 4,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized | |||
| Weighted average period | 2 years 6 months | |||
| Options outstanding | 1,274,986us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,691,734us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,825,532us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,993,736us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |
| Weighted Average Fair Value of Options Granted | $ 25.59us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 19.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 8.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | |
| Employee Stock [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Share price |
$ 39.22us-gaap_SharePrice / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |
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| Investment as percentage of cash compensation |
20.00%atro_InvestmentAsPercentageOfCashCompensation / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |
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| Common stock price to market value |
85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |
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| Cash compensation limit |
$ 21,250atro_CashCompensationLimit / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |
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| Number of shares employees had subscribed to purchase |
69,195us-gaap_EmployeeServiceShareBasedCompensationEstimatedQuantityOfSharesToBeRepurchasedInFollowingPeriod / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |
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| Weighted Average Fair Value of Options Granted |
$ 11.11us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |
$ 7.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |
$ 4.16us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_EmployeeStockMember |
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| Director [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Period of options granted | 6 months | |||
| Key Employee [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Period of options granted | 5 years | |||
| Maximum [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Share based payment award options exercisable period | 10 years | |||
| Stock Incentive Plan [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Share based payment award options exercisable period | 10 years | |||
| Period of options granted | 5 years | |||
| Options outstanding |
1,061,202us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = atro_StockIncentivePlanMember |
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| Options available for future grant |
575,989us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = atro_StockIncentivePlanMember |
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| Directors Stock Option Plan [Member] | ||||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||
| Share based payment award options exercisable period | 10 years | |||
| Period of options granted | 6 months | |||
| Options outstanding |
213,784us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = atro_DirectorsStockOptionPlanMember |
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| Options available for future grant |
162,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = atro_DirectorsStockOptionPlanMember |
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| X | ||||||||||
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- Definition
Cash compensation limit. No definition available.
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| X | ||||||||||
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- Definition
Investment as percentage of cash compensation. No definition available.
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| X | ||||||||||
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- Definition
Share based compensation arrangement by share based payment award options exercisable period. No definition available.
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| X | ||||||||||
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- Definition
Number of shares to be repurchased in accordance with a policy to use treasury stock to satisfy share-award conversions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Unrecognized cost of unvested share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Purchase price of common stock expressed as a percentage of its fair value. No definition available.
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| X | ||||||||||
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- Definition
Price of a single share of a number of saleable stocks of a company. No definition available.
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- Details
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