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Supplemental Financial Data (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
Statement of Operations Data
Net revenues	$ 511,800	$ 486,267	$ 480,757	$ 437,153	$ 405,140	$ 380,660	$ 325,861	$ 183,681	$ 1,915,977	$ 1,295,342	$ 813,524
Gross profit	238,326	227,995	219,583	205,547	183,408	168,385	135,913	77,913	891,451	565,619	362,872
Income from operations	120,016	110,155	92,883	83,580	62,514	53,008	19,186	22,559	406,634	157,267	156,612
Net income	$ 77,638	$ 75,994	$ 120,440	$ 65,060	$ 45,487	$ 32,549	$ 9,210	$ 17,563	$ 339,132	$ 104,809	$ 122,297
Net income per share:
Basic	$ 1.43	$ 1.40	$ 2.22	$ 1.21	$ 0.85	$ 0.61	$ 0.17	$ 0.33	$ 6.26	$ 1.96	$ 2.30
Diluted	1.41	1.38	2.19	1.18	0.83	0.60	0.17	0.33	6.16	1.94	2.28
Cash dividends paid per common share	$ 0.180	$ 0.175	$ 0.175	$ 0.175	$ 0.170	$ 0.170	$ 0.170	$ 0.170	$ 0.71	$ 0.68	$ 0.68

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