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Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net sales | $ 995,703 |  | $ 1,266,930 |  | $ 1,021,814 |  | $ 805,407 |  | $ 805,891 |  | $ 1,139,643 |  | $ 874,642 |  | $ 792,738 |  | $ 4,089,854 |  | $ 3,612,914 |  | $ 3,763,971 |
Gross profit | 158,802 |  | 212,559 |  | 165,189 |  | 124,566 |  | 110,013 |  | 181,939 |  | 127,707 |  | 113,877 |  | 661,116 |  | 533,536 |  | 554,126 |
Net income | $ 146,119 | [1] | $ 72,382 | [1] | $ 27,926 | [1] | $ 23,232 | [1] | $ 23,694 | [2] | $ 69,770 | [2] | $ 33,315 | [2] | $ 26,572 | [2] | $ 269,659 |  | $ 153,351 |  | $ 172,413 |
Basic net income per share (in dollars per share) | $ 1.32 | [1],[3] | $ 0.66 | [1],[3] | $ 0.25 | [1],[3] | $ 0.21 | [1],[3] | $ 0.20 | [2],[3] | $ 0.58 | [2],[3] | $ 0.28 | [2],[3] | $ 0.22 | [2],[3] | $ 2.44 | [4] | $ 1.28 | [4] | $ 1.41 | [4]
Diluted net income per share (in dollars per share) | 1.31 | [1],[3] | 0.65 | [1],[3] | 0.25 | [1],[3] | 0.21 | [1],[3] | 0.20 | [2],[3] | 0.57 | [2],[3] | 0.27 | [2],[3] | 0.22 | [2],[3] | 2.42 | [4] | 1.27 | [4] | 1.41 | [4]
Dividends per share (in dollars per share) | $ 0.09 |  | $ 0.09 |  | $ 0.09 |  | $ 0.09 |  | $ 0.085 |  | $ 0.085 |  | $ 0.085 |  | $ 0.085 |  | $ 0.36 | [4] | $ 0.34 | [4] | $ 0.32 | [4]
Rationalization charges | $ 1,300 | [1] | $ 600 | [1] | $ 3,000 | [1] | $ 900 | [1] | $ 5,100 | [2] | $ 7,800 | [2] | $ 5,000 | [2] | $ 1,100 | [2] | $ 5,826 |  | $ 19,061 |  | $ 14,407 |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 356,990 |  | 299,730 |  | 319,812 |
Loss on early extinguishment of debt |  |  |  |  | 4,400 |  | 2,700 |  |  |  |  |  |  |  |  |  | 7,052 |  | 0 |  | 0 |
Income tax benefit from impact of 2017 Tax Act | 110,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs | $ 900 |  | $ 800 |  | $ 9,800 |  | $ 13,200 |  | $ 1,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | 0 |
Rationalization charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (43,027) | [5] | (20,003) | [5] | $ (16,200) |
Business Combination, Acquisition Related Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,700 |  | $ 1,400 |  |  |
[1] | The first, second, third and fourth quarters of 2017 include rationalization charges of $0.9 million, $3.0 million, $0.6 million and $1.3 million, respectively. The first, second, third and fourth quarters of 2017 includes costs attributed to announced acquisitions of $13.2 million, $9.8 million, $0.8 million and $0.9 million, respectively. The first and second quarters of 2017 include a loss on early extinguishment of debt of $2.7 million and $4.4 million, respectively. The fourth quarter of 2017 includes the benefit from effective tax rate adjustments totaling $110.9 million primarily related to the remeasurement of net deferred tax liabilities to reflect the lower future cash tax obligations as a result of the reduction in the federal corporate tax rate under the 2017 Tax Act.
[2] | The first, second, third and fourth quarters of 2016 include rationalization charges of $1.1 million, $5.0 million, $7.8 million and $5.1 million, respectively. The fourth quarter of 2016 includes costs attributed to announced acquisitions of $1.4 million.
[3] | Net income per share data is computed independently for each of the periods presented. Accordingly, the sum of the quarterly earnings per share amounts may not equal the total for the year.
[4] | Per share amounts for 2016 and 2015 have been retroactively adjusted for the two-for-one stock split discussed in Note 1.
[5] | Corporate includes costs attributed to announced acquisitions of $24.7 million and $1.4 million in 2017 and 2016, respectively.

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