Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Net revenues	$ 908,356	$ 841,251	$ 842,980	$ 825,678	$ 904,763	$ 813,270	$ 796,759	$ 760,802	$ 3,418,265	$ 3,275,594	$ 3,142,856
Gross margin	770,204	703,276	698,658	686,586	702,010	667,016	664,008	628,196	2,858,724	2,661,230	2,522,637
Income from operations	231,290	153,827	153,087	110,954	112,406	63,798	122,149	51,732	649,158	350,085	302,311
Net income	$ 199,850	$ 131,901	$ 120,898	$ 83,463	$ 131,274	$ 55,925	$ 103,275	$ 28,887	$ 536,112	$ 319,361	$ 251,723
Earnings per share - basic (USD per share)	$ 1.28	$ 0.85	$ 0.78	$ 0.54	$ 0.85	$ 0.35	$ 0.64	$ 0.18	$ 3.46	$ 2.01	$ 1.48
Earnings per share - diluted (USD per share)	$ 1.26	$ 0.84	$ 0.77	$ 0.54	$ 0.84	$ 0.35	$ 0.64	$ 0.18	$ 3.41	$ 1.99	$ 1.47