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Unaudited Quarterly Results - Schedule of Unaudited Quarterly Results (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 715,019 | $ 578,021 | $ 596,219 | $ 530,670 | $ 687,275 | $ 565,584 | $ 558,250 | $ 497,969 | $ 2,419,929 | $ 2,309,078 | $ 2,167,423
Cost of sales | 286,869 | 241,139 | 243,135 | 221,421 | 270,453 | 235,892 | 229,627 | 211,095 | 992,564 | 947,067 |
Selling and administrative expenses | 142,853 | 126,997 | 136,645 | 130,407 | 148,391 | 135,206 | 130,093 | 130,673 | 536,902 | 544,363 | 512,331
Research and development expenses | 38,106 | 35,173 | 35,644 | 34,480 | 35,122 | 33,782 | 32,937 | 30,752 | 143,403 | 132,593 | 125,187
Purchased intangibles amortization | 2,337 | 2,114 | 1,602 | 1,659 | 1,639 | 1,682 | 1,693 | 1,729 | 7,712 | 6,743 | 9,889
Litigation (settlement) provisions | 322 | 924 |  | (1,672) | 1,096 |  | 10,018 |  | (426) | 11,114 | 3,524
Acquired in-process research and development |  |  |  |  |  |  |  | 5,000 |  | 5,000 |
Total costs and operating expenses | 470,487 | 406,347 | 417,026 | 386,295 | 456,701 | 406,562 | 404,368 | 379,249 | 1,680,155 | 1,646,880 | 1,542,384
Operating income | 244,532 | 171,674 | 179,193 | 144,375 | 230,574 | 159,022 | 153,882 | 118,720 | 739,774 | 662,198 | 625,039
Other income (expense) | (45,501) | (811) | (1,828) | 346 | (404) | 12 | (97) | 149 | (47,794) | (340) | (700)
Interest expense | (11,676) | (11,435) | (11,692) | (13,838) | (15,281) | (14,750) | (14,083) | (12,725) | (48,641) | (56,839) | (44,911)
Interest income | 10,451 | 9,802 | 8,888 | 9,666 | 10,849 | 9,516 | 8,370 | 7,343 | 38,807 | 36,078 | 20,686
Income before income taxes | 197,806 | 169,230 | 174,561 | 140,549 | 225,738 | 153,800 | 148,072 | 113,487 | 682,146 | 641,097 | 600,114
Provision for income taxes | 12,654 | 28,216 | 18,884 | 28,598 | 578,910 | 17,696 | 16,250 | 7,930 | 88,352 | 620,786 | 78,611
Net income (loss) | $ 185,152 | $ 141,014 | $ 155,677 | $ 111,951 | $ (353,172) | $ 136,104 | $ 131,822 | $ 105,557 | $ 593,794 | $ 20,311 | $ 521,503
Net income (loss) per basic common share | $ 2.48 | $ 1.84 | $ 2.00 | $ 1.42 | $ (4.44) | $ 1.71 | $ 1.65 | $ 1.32 | $ 7.71 | $ 0.25 | $ 6.46
Weighted-average number of basic common shares | 74,802 | 76,575 | 77,833 | 78,883 | 79,454 | 79,712 | 79,979 | 80,073 | 76,992 | 79,793 | 80,786
Net income (loss) per diluted common share | $ 2.46 | $ 1.83 | $ 1.98 | $ 1.40 | $ (4.44) | $ 1.69 | $ 1.63 | $ 1.31 | $ 7.65 | $ 0.25 | $ 6.41
Weighted-average number of diluted common shares and equivalents | 75,345 | 77,136 | 78,438 | 79,715 | 79,454 | 80,521 | 80,756 | 80,769 | 77,618 | 80,604 | 81,417

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