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Goodwill - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
	Apr. 19, 2013	Dec. 24, 2012	Jun. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Acquisition related contingent consideration			$ 4.5	$ 4.5	$ 4.3
Strata [Member]
Business Acquisition [Line Items]
Voting equity interests acquired		100.00%
Annual sales					20
Date of acquisition				Dec. 24, 2012
Purchase price		53.1
Payable in cash			5.0	5.0
Acquisition related contingent consideration			4.5	4.5
Transfer of common stock				60,368
Fair value of pre determined target at acquisition date				2.0
Cash proceeds from acquisition post closing working capital adjustment	0.6
Reduction in other net assets			0.4
Increase in goodwill			$ 0.4

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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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