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Goodwill - Additional Information (Detail) (Bachman Group Companies [Member], USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	6 Months Ended
	Nov. 04, 2013	Jun. 30, 2014
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
Reduction in purchase price of post-closing working capital adjustments		0.3
Reduction in other net assets		$ 0.3

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

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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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