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Supplemental Financial Data (Detail) - USD ($) $ / shares in Units, $ 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
Statement of Operations Data
Net revenues	$ 460,541	$ 487,152	$ 573,140	$ 554,275	$ 511,800	$ 486,267	$ 480,757	$ 437,153	$ 2,075,108	$ 1,915,977	$ 1,295,342
Gross profit	209,884	231,860	274,877	262,855	238,326	227,995	219,583	205,547	979,476	891,451	565,619
Income from operations	94,084	117,045	151,291	131,639	120,016	110,155	92,883	83,580	494,059	406,634	157,267
Net income	$ 71,636	$ 93,277	$ 122,862	$ 105,121	$ 77,638	$ 75,994	$ 120,440	$ 65,060	$ 392,896	$ 339,132	$ 104,809
Net income per share:
Basic	$ 1.33	$ 1.71	$ 2.25	$ 1.93	$ 1.43	$ 1.40	$ 2.22	$ 1.21	$ 7.22	$ 6.26	$ 1.96
Diluted	1.32	1.70	2.22	1.90	1.41	1.38	2.19	1.18	7.14	6.16	1.94
Cash dividends paid per common share	$ 0.200	$ 0.200	$ 0.200	$ 0.180	$ 0.180	$ 0.175	$ 0.175	$ 0.175	$ 0.78	$ 0.71	$ 0.68

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