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Unaudited Quarterly Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 523,899 us-gaap_SalesRevenueNet | $ 533,179 us-gaap_SalesRevenueNet | $ 546,693 us-gaap_SalesRevenueNet | $ 543,996 us-gaap_SalesRevenueNet | $ 520,620 us-gaap_SalesRevenueNet | $ 490,617 us-gaap_SalesRevenueNet | $ 518,445 us-gaap_SalesRevenueNet | $ 494,448 us-gaap_SalesRevenueNet | $ 2,147,767 us-gaap_SalesRevenueNet |  | $ 2,024,130 us-gaap_SalesRevenueNet |  | $ 1,954,258 us-gaap_SalesRevenueNet |
Gross profit | 229,117 us-gaap_GrossProfit | 234,646 us-gaap_GrossProfit | 241,132 us-gaap_GrossProfit | 244,420 us-gaap_GrossProfit | 227,009 us-gaap_GrossProfit | 211,509 us-gaap_GrossProfit | 222,849 us-gaap_GrossProfit | 211,997 us-gaap_GrossProfit | 949,315 us-gaap_GrossProfit |  | 873,364 us-gaap_GrossProfit |  | 803,700 us-gaap_GrossProfit |
Operating income | 94,454 us-gaap_OperatingIncomeLoss | 110,847 us-gaap_OperatingIncomeLoss | 112,088 us-gaap_OperatingIncomeLoss | 113,835 us-gaap_OperatingIncomeLoss | 103,873 us-gaap_OperatingIncomeLoss | 97,369 us-gaap_OperatingIncomeLoss | 99,559 us-gaap_OperatingIncomeLoss | 94,712 us-gaap_OperatingIncomeLoss | 431,224 us-gaap_OperatingIncomeLoss | [1] | 395,513 us-gaap_OperatingIncomeLoss | [1] | 128,218 us-gaap_OperatingIncomeLoss | [1]
Net income | $ 61,620 us-gaap_NetIncomeLoss | $ 71,441 us-gaap_NetIncomeLoss | $ 71,777 us-gaap_NetIncomeLoss | $ 74,548 us-gaap_NetIncomeLoss | $ 67,555 us-gaap_NetIncomeLoss | $ 63,799 us-gaap_NetIncomeLoss | $ 62,561 us-gaap_NetIncomeLoss | $ 61,300 us-gaap_NetIncomeLoss | $ 279,386 us-gaap_NetIncomeLoss |  | $ 255,215 us-gaap_NetIncomeLoss |  | $ 37,630 us-gaap_NetIncomeLoss |
Basic EPS | $ 0.78 us-gaap_EarningsPerShareBasic | $ 0.89 us-gaap_EarningsPerShareBasic | $ 0.89 us-gaap_EarningsPerShareBasic | $ 0.92 us-gaap_EarningsPerShareBasic | $ 0.83 us-gaap_EarningsPerShareBasic | $ 0.78 us-gaap_EarningsPerShareBasic | $ 0.76 us-gaap_EarningsPerShareBasic | $ 0.74 us-gaap_EarningsPerShareBasic | $ 3.48 us-gaap_EarningsPerShareBasic |  | $ 3.11 us-gaap_EarningsPerShareBasic |  | $ 0.45 us-gaap_EarningsPerShareBasic |
Diluted EPS | $ 0.77 us-gaap_EarningsPerShareDiluted | $ 0.88 us-gaap_EarningsPerShareDiluted | $ 0.88 us-gaap_EarningsPerShareDiluted | $ 0.91 us-gaap_EarningsPerShareDiluted | $ 0.82 us-gaap_EarningsPerShareDiluted | $ 0.78 us-gaap_EarningsPerShareDiluted | $ 0.76 us-gaap_EarningsPerShareDiluted | $ 0.74 us-gaap_EarningsPerShareDiluted | $ 3.45 us-gaap_EarningsPerShareDiluted |  | $ 3.09 us-gaap_EarningsPerShareDiluted |  | $ 0.45 us-gaap_EarningsPerShareDiluted |
Basic weighted average shares outstanding | 78,669 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 79,558 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 80,106 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 80,527 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 80,782 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 81,259 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 81,829 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 82,197 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 79,715 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 81,517 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 82,689 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Diluted weighted average shares outstanding | 79,632 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 80,561 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 81,149 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 81,575 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 81,854 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 82,218 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 82,734 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 83,152 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 80,728 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 82,489 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 83,641 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
[1] | Segment operating income (loss) excludes net unallocated corporate operating expenses.

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