Consolidated Statements of Total Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2017	$ 4,682,477	$ 628	$ 3,368,007	$ (129,104)	$ 1,440,069	$ 4,679,600	$ 2,877
Beginning Balance (in shares) at Dec. 31, 2017		62,873
Consolidated net earnings	375,896				375,621	375,621	275
Other comprehensive earnings, net of tax	7,614			7,613		7,613	1
Dividends declared	(86,190)				(86,190)	(86,190)
Issuances of common stock for stock award plans	14,039	$ 1	14,038			14,039
Issuances of common stock for stock award plans (in shares)		144
Shares withheld for employees' income tax obligations	(10,416)		(10,416)			(10,416)
Repurchases of common stock	(60,377)	$ (3)			(60,374)	(60,377)
Repurchases of common stock, Shares		(305)
Stock-based compensation expense	23,084		23,084			23,084
Noncontrolling interest acquired in business combination	9,001						9,001
Purchase of remaining interest in existing joint venture	(12,800)		(3,580)			(3,580)	(9,220)
Ending Balance at Sep. 30, 2018	4,942,328	$ 626	3,391,133	(121,491)	1,669,126	4,939,394	2,934
Ending Balance (in shares) at Sep. 30, 2018		62,712
Beginning Balance at Jun. 30, 2018	4,855,470	$ 629	3,389,028	(125,883)	1,579,674	4,843,448	12,022
Beginning Balance (in shares) at Jun. 30, 2018		63,012
Consolidated net earnings	180,353				180,221	180,221	132
Other comprehensive earnings, net of tax	4,392			4,392		4,392
Dividends declared	(30,394)				(30,394)	(30,394)
Issuances of common stock for stock award plans	49		49			49
Issuances of common stock for stock award plans (in shares)		5
Shares withheld for employees' income tax obligations	(350)		(350)			(350)
Repurchases of common stock	(60,378)	$ (3)			(60,375)	(60,378)
Repurchases of common stock, Shares		(305)
Stock-based compensation expense	5,986		5,986			5,986
Purchase of remaining interest in existing joint venture	(12,800)		(3,580)			(3,580)	(9,220)
Ending Balance at Sep. 30, 2018	4,942,328	$ 626	3,391,133	(121,491)	1,669,126	4,939,394	2,934
Ending Balance (in shares) at Sep. 30, 2018		62,712
Beginning Balance at Dec. 31, 2018	4,949,412	$ 624	3,396,059	(143,579)	1,693,259	4,946,363	3,049
Beginning Balance (in shares) at Dec. 31, 2018		62,515
Consolidated net earnings	480,918				480,901	480,901	17
Other comprehensive earnings, net of tax	8,814			8,814		8,814
Dividends declared	(95,227)				(95,227)	(95,227)
Issuances of common stock for stock award plans	15,413	$ 2	15,411			15,413
Issuances of common stock for stock award plans (in shares)		246
Shares withheld for employees' income tax obligations	(25,418)		(25,418)			(25,418)
Repurchases of common stock	(57,288)	$ (2)			(57,286)	(57,288)
Repurchases of common stock, Shares		(261)
Stock-based compensation expense	28,414		28,414			28,414
Distributions to owners of noncontrolling interest	(600)						(600)
Ending Balance at Sep. 30, 2019	5,304,438	$ 624	3,414,466	(134,765)	2,021,647	5,301,972	2,466
Ending Balance (in shares) at Sep. 30, 2019		62,500
Beginning Balance at Jun. 30, 2019	5,097,270	$ 623	3,416,590	(137,334)	1,814,974	5,094,853	2,417
Beginning Balance (in shares) at Jun. 30, 2019		62,433
Consolidated net earnings	248,622				248,573	248,573	49
Other comprehensive earnings, net of tax	2,569			2,569		2,569
Dividends declared	(34,612)				(34,612)	(34,612)
Issuances of common stock for stock award plans	4,957	$ 1	4,956			4,957
Issuances of common stock for stock award plans (in shares)		96
Shares withheld for employees' income tax obligations	(13,244)		(13,244)			(13,244)
Repurchases of common stock	(7,288)				(7,288)	(7,288)
Repurchases of common stock, Shares		(29)
Stock-based compensation expense	6,164		6,164			6,164
Ending Balance at Sep. 30, 2019	$ 5,304,438	$ 624	$ 3,414,466	$ (134,765)	$ 2,021,647	$ 5,301,972	$ 2,466
Ending Balance (in shares) at Sep. 30, 2019		62,500