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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net sales $ 716,294 $ 577,278 $ 599,162 $ 513,862 $ 715,019 $ 578,021 $ 596,219 $ 530,670 $ 2,406,596 $ 2,419,929 $ 2,309,078
Costs and operating expenses:                      
Cost of sales 299,068 241,055 249,546 221,031 286,869 241,139 243,135 221,421 1,010,700 992,564  
Selling and administrative expenses 141,208 126,036 133,208 134,339 142,853 126,997 136,645 130,407 534,791 536,902 544,363
Research and development expenses 37,072 34,333 36,490 35,060 38,106 35,173 35,644 34,480 142,955 143,403 132,593
Litigation provisions         322 924   (1,672)   (426) 11,114
Purchased intangibles amortization 2,529 2,619 2,264 2,281 2,337 2,114 1,602 1,659 9,693 7,712 6,743
Total costs and operating expenses 479,877 404,043 421,508 392,711 470,487 406,347 417,026 386,295 1,698,139 1,680,155 1,646,880
Operating income 236,417 173,235 177,654 121,151 244,532 171,674 179,193 144,375 708,457 739,774 662,198
Other expense (2,223) (496) (342) (525) (45,501) (811) (1,828) 346 (3,586) (47,794) (340)
Interest expense (14,223) (11,456) (11,448) (11,563) (11,676) (11,435) (11,692) (13,838) (48,690) (48,641) (56,839)
Interest income 4,417 3,455 5,871 8,315 10,451 9,802 8,888 9,666 22,058 38,807 36,078
Income before income taxes 224,388 164,738 171,735 117,378 197,806 169,230 174,561 140,549 678,239 682,146 641,097
Provision for income taxes 23,719 26,605 27,325 8,392 12,654 28,216 18,884 28,598 86,041 88,352 620,786
Net income $ 200,669 $ 138,133 $ 144,410 $ 108,986 $ 185,152 $ 141,014 $ 155,677 $ 111,951 $ 592,198 $ 593,794 $ 20,311
Net income per basic common share $ 3.15 $ 2.09 $ 2.09 $ 1.52 $ 2.48 $ 1.84 $ 2.00 $ 1.42 $ 8.76 $ 7.71 $ 0.25
Weighted-average number of basic common shares 63,795 66,226 68,989 71,704 74,802 76,575 77,833 78,883 67,627 76,992 79,793
Net income per diluted common share $ 3.12 $ 2.07 $ 2.08 $ 1.51 $ 2.46 $ 1.83 $ 1.98 $ 1.40 $ 8.69 $ 7.65 $ 0.25
Weighted-average number of diluted common shares and equivalents 64,348 66,768 69,494 72,415 75,345 77,136 78,438 79,715 68,166 77,618 80,604