Acquisition - Summary of Unaudited Pro Forma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Business Combinations [Abstract]
Net sales	$ 140,194	$ 106,168	$ 442,941	$ 384,294
Net income	$ 20,098	$ 7,787	$ 76,829	$ 55,217
Basic earnings per common share	$ 0.68	$ 0.27	$ 2.61	$ 1.88
Diluted earnings per common share	$ 0.68	$ 0.26	$ 2.60	$ 1.86
Pro Forma Net sales			$ 475,076	$ 427,043
Pro Forma Net income			$ 77,570	$ 54,978
Pro Forma Basic earnings per common share			$ 2.64	$ 1.87
Pro Forma Diluted earnings per common share			$ 2.62	$ 1.86

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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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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