Condensed Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional paid-in capital	Retained earnings	Retained earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated other comprehensive loss	Total shareholders' equity	Total shareholders' equity Cumulative Effect, Period of Adoption, Adjustment	Noncontrolling interest
Balance at Dec. 31, 2018	$ 1,987,720		$ 1,716	$ 1,896	$ 2,088,707		$ (105,481)	$ 1,986,838		$ 882
Balance (in shares) at Dec. 31, 2018			171,582
Increase (Decrease) in Equity [Roll Forward]
Shares issued under employee stock plans	113,516		$ 28	113,488				113,516
Shares issued under employee stock plans (in shares)			2,751
Shares repurchased under provisions ofstock repurchase plans	(296,922)		$ (42)	(141,847)	(155,033)			(296,922)
Shares repurchased under provisions of stock repurchase plans (in shares)			(4,090)
Stock compensation expense	49,361			49,361				49,361
Net earnings	454,268				453,069			453,069		1,199
Other comprehensive income (loss)	(13,472)						(13,293)	(13,293)		(179)
Dividends paid	(85,184)			403	(85,587)			(85,184)
Balance at Sep. 30, 2019	2,209,287		$ 1,702	23,301	2,301,156		(118,774)	2,207,385		1,902
Balance (in shares) at Sep. 30, 2019			170,243
Balance at Jun. 30, 2019	2,052,394		$ 1,701	12,433	2,140,935		(104,096)	2,050,973		1,421
Balance (in shares) at Jun. 30, 2019			170,040
Increase (Decrease) in Equity [Roll Forward]
Shares issued under employee stock plans	60,713		$ 11	60,702				60,713
Shares issued under employee stock plans (in shares)			1,095
Shares repurchased under provisions ofstock repurchase plans	(61,999)		$ (10)	(61,989)				(61,999)
Shares repurchased under provisions of stock repurchase plans (in shares)			(892)
Stock compensation expense	12,155			12,155				12,155
Net earnings	160,627				160,221			160,221		406
Other comprehensive income (loss)	(14,603)						(14,678)	(14,678)		75
Balance at Sep. 30, 2019	2,209,287		$ 1,702	23,301	2,301,156		(118,774)	2,207,385		1,902
Balance (in shares) at Sep. 30, 2019			170,243
Balance at Dec. 31, 2019	$ 2,197,219	$ 6,074	$ 1,696	3,203	2,321,316	$ 6,074	(131,187)	2,195,028	$ 6,074	2,191
Balance (in shares) at Dec. 31, 2019	169,622		169,622
Increase (Decrease) in Equity [Roll Forward]
Shares issued under employee stock plans	$ 163,450		$ 40	163,410				163,450
Shares issued under employee stock plans (in shares)			4,009
Shares repurchased under provisions ofstock repurchase plans	(314,225)		$ (44)	(66,780)	(247,401)			(314,225)
Shares repurchased under provisions of stock repurchase plans (in shares)			(4,400)
Stock compensation expense	45,091			45,091				45,091
Net earnings	498,689				497,520			497,520		1,169
Other comprehensive income (loss)	(5,010)						(4,094)	(4,094)		(916)
Dividends paid	(86,815)			1,000	(87,815)			(86,815)
Balance at Sep. 30, 2020	$ 2,504,473		$ 1,692	145,924	2,489,694		(135,281)	2,502,029		2,444
Balance (in shares) at Sep. 30, 2020	169,231		169,231
Balance at Jun. 30, 2020	$ 2,161,598		$ 1,668	12,221	2,298,387		(153,158)	2,159,118		2,480
Balance (in shares) at Jun. 30, 2020			166,816
Increase (Decrease) in Equity [Roll Forward]
Shares issued under employee stock plans	121,430		$ 24	121,406				121,430
Shares issued under employee stock plans (in shares)			2,415
Stock compensation expense	12,297			12,297				12,297
Net earnings	191,719				191,307			191,307		412
Other comprehensive income (loss)	17,429						17,877	17,877		(448)
Balance at Sep. 30, 2020	$ 2,504,473		$ 1,692	$ 145,924	$ 2,489,694		$ (135,281)	$ 2,502,029		$ 2,444
Balance (in shares) at Sep. 30, 2020	169,231		169,231