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Subsequent Events - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended		1 Months Ended
	Aug. 30, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Nov. 04, 2013 Subsequent Event [Member] Bachman Group Companies [Member]
Subsequent Event [Line Items]
Date of acquisition						Nov. 04, 2013
Percentage of voting equity interests acquired						100.00%
Business acquisition, consideration	$ 51.2					$ 45.0
Business acquisition, common stock issued						319,953
Purchase price of common stock	6.2					15.0
Annual sales		$ 192.8	$ 183.4	$ 577.2	$ 562.7	$ 80.0

X

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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Number of shares of equity interests issued or issuable to acquire entity.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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