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Stock Based Compensation Expense - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended					9 Months Ended		3 Months Ended		9 Months Ended								3 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2013 Stock Options	Sep. 30, 2012 Stock Options	Sep. 30, 2013 Stock Options	Sep. 30, 2012 Stock Options	Sep. 30, 2013 Restricted Stock	Sep. 30, 2012 Restricted Stock	Sep. 30, 2013 Restricted Stock	Sep. 30, 2012 Restricted Stock	Sep. 30, 2013 Restricted Stock Vested immediately	Sep. 30, 2012 Restricted Stock Vested immediately	Sep. 30, 2013 Restricted Stock Cliff Vest Four Hundred Fifty Days	Sep. 30, 2013 Restricted Stock Cliff Vest After Three Years	Sep. 30, 2012 Restricted Stock Cliff Vest After Three Years	Sep. 30, 2012 Restricted Stock Cliff Vest Ninety Days	Sep. 30, 2013 Performance Shares	Jun. 30, 2013 Performance Shares	Sep. 30, 2013 Performance Shares	Sep. 30, 2013 Performance Shares Maximum	Sep. 30, 2013 Performance Shares Performance based shares based upon net income and net sales for the period commencing April 1, 2013 and ending December 31, 2015	Sep. 30, 2013 Performance Shares Performance based shares based upon AVD stock price appreciation over the course of the period commencing June 6, 2013 and ending on December 31, 2015	Sep. 30, 2013 Performance Shares Cliff Vest After Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				$ 201	$ 236	$ 624	$ 668	$ 856	$ 589	$ 2,153	$ 1,188							$ 92		$ 118
Nonvested unamortized stock-based compensation expense, value				186		186		6,370		6,370
Nonvested unamortized stock-based compensation expense, contractual term						3 months 18 days				2 years 1 month 6 days										2 years 8 months 12 days
Number of Shares, Granted	4,500	8,230	145,884							158,614	247,536								24,637					24,637
Number of shares vested	5,000	8,230								13,230	99,992	8,230	13,352
Number of shares expected to vest														1,500	148,884	227,184	7,000
Expenses recognized period														450 days	3 years	3 years	90 days							3 years
Weighted Average Grant-Date Fair Value, Granted	$ 24.27	$ 30.19	$ 31.27							$ 31.06	$ 21.24								$ 30.13			$ 30.13	$ 15.31
Weighted Average Grant-Date Fair Value, Vested	$ 8.32	$ 30.37								$ 22.04	$ 14.13
Average vest date value Restricted share										$ 24.01	$ 19.29
Number of Shares, Forfeited			8,000							8,000	1,367
Weighted Average Grant-Date Fair Value, Forfeited			$ 22.17							$ 22.17	$ 20.47
Percentage of shares vesting based on Performance																						80.00%	20.00%
Targeted performance percentage																					200.00%
Unamortized stock-based compensation expense																		$ 623		$ 623

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Share based compensation by share based payment awards equity instrument other than option average vest date value restricted stock.

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Stock options unamortized stock based compensation expenses related to unvested stock options outstanding.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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