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Supplemental Financial Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement of Operations Data                      
Net sales $ 204,394 $ 166,453 $ 156,928 $ 141,645 $ 133,796 $ 141,447 $ 177,397 $ 190,868 $ 669,420 $ 643,508 $ 822,517
Gross profit 87,680 62,234 61,958 54,702 52,601 56,571 76,516 83,791 266,574 269,479 374,988
Income from operations 30,952 12,332 10,427 4,676 6,615 6,392 27,847 33,369 58,387 74,223 184,925
Net income $ 20,237 $ 2,458 $ 7,320 $ 5,761 $ 4,109 $ 2,580 $ 18,572 $ 22,768 $ 35,776 $ 48,029 $ 129,731
Net income per share:                      
Basic $ 0.38 $ 0.05 $ 0.14 $ 0.11 $ 0.08 $ 0.05 $ 0.35 $ 0.43 $ 0.67 $ 0.91 $ 2.49
Diluted $ 0.38 $ 0.05 $ 0.14 $ 0.11 $ 0.08 $ 0.05 $ 0.35 $ 0.43 $ 0.67 $ 0.90 $ 2.45
Cash dividends paid per common share $ 0.16 $ 0.16 $ 0.16 $ 0.16 $ 0.16 $ 0.16 $ 0.15 $ 0.15 $ 0.64 $ 0.62 $ 0.60