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Goodwill - Additional Information (Detail) (Bachman Group Companies [Member], USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Nov. 04, 2013
Bachman Group Companies [Member]
Business Acquisition [Line Items]
Voting equity interests acquired		100.00%
Purchase price of cash	$ 45.8
Issuance of common stock	319,953
Purchase price of common stock	$ 15
Date of acquisition	Nov. 04, 2013

X

- Definition

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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