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Schedule of Quarterly Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Effect of Fourth Quarter Events [Line Items]                      
Net sales $ 104,262 $ 89,836 $ 84,837 $ 87,255 $ 81,776 $ 73,209 $ 80,062 $ 66,033 $ 366,190 $ 301,080 $ 226,859
Gross profit 45,776 39,625 38,346 37,378 33,912 30,565 31,681 26,910 161,125 123,068 86,321
Net income $ 11,313 $ 8,076 $ 8,744 $ 8,734 $ 6,431 $ 4,618 $ 6,007 $ 5,012 $ 36,867 $ 22,068 $ 10,984
Basic net income per share $ 0.40 $ 0.29 $ 0.31 $ 0.32 $ 0.23 $ 0.17 $ 0.22 $ 0.18 $ 1.32 $ 0.80 $ 0.40
Diluted net income per share $ 0.39 $ 0.28 $ 0.30 $ 0.31 $ 0.23 $ 0.16 $ 0.22 $ 0.18 $ 1.28 $ 0.79 $ 0.40