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Summary of Quarterly Financial 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
Quarterly Financial Data [Line Items]                      
Net sales $ 736,579 $ 723,473 $ 712,468 $ 671,357 $ 654,306 $ 670,824 $ 665,481 $ 629,500 $ 2,843,877 $ 2,620,111 $ 2,435,606
Gross profit 173,950 162,552 158,108 145,019 134,157 137,747 136,901 133,141 639,629 541,946 532,200
Income from operations 98,419 92,072 83,858 169,110 67,807 71,180 67,859 65,903 443,459 272,749 185,382
Net income $ 61,031 $ 39,791 $ 45,154 $ 17,844 $ 39,465 $ 41,777 $ 39,368 $ 37,417 $ 163,820 $ 158,027 $ 205,435
Basic earnings per share $ 0.63 $ 0.41 $ 0.47 $ 0.18 $ 0.41 $ 0.42 $ 0.39 $ 0.37 $ 1.70 $ 1.59 $ 2.02
Diluted earnings per share $ 0.63 $ 0.41 $ 0.46 $ 0.18 $ 0.40 $ 0.42 $ 0.39 $ 0.37 $ 1.68 $ 1.57 $ 2.00
Stock price - high $ 38.67 $ 36.68 $ 29.80 $ 30.62 $ 27.16 $ 29.19 $ 29.88 $ 30.69 $ 38.67 $ 30.69  
Stock price - low $ 33.89 $ 27.59 $ 25.77 $ 24.82 $ 21.75 $ 21.05 $ 26.26 $ 25.96 $ 24.82 $ 21.05