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Acquisitions - Summary of Unaudited Proforma Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Business Combination Increase Decrease To Reflect Liabilities Acquired At Fair Value [Abstract] |  |  |  |
Pro forma sales | $ 166,979 | $ 152,708 | $ 505,891 | $ 457,466
Pro forma net income | $ 4,867 | $ 5,436 | $ 19,815 | $ (224)

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