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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
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