Earnings Per Share (Schedule of Earnings Per Share) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2019		Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income attributable to the Company	$ 223,998		$ 187,182		$ 186,655		$ 109,575		$ 91,649		$ 151,480		$ 155,140		$ 76,227		$ 707,410	$ 474,496	$ 423,049
Basic weighted-average common shares																	113,080	112,613	111,668
Effect of dilutive employee stock options and RSUs																	575	666	767
Diluted weighted-average common shares																	113,655	113,279	112,435
Basic	$ 1.98	[1]	$ 1.65	[1]	$ 1.65	[1]	$ 0.97	[1]	$ 0.81	[1]	$ 1.34	[1]	$ 1.38	[1]	$ 0.68	[1]	$ 6.26	$ 4.21	$ 3.79
Diluted	$ 1.97	[1]	$ 1.65	[1]	$ 1.64	[1]	$ 0.97	[1]	$ 0.81	[1]	$ 1.34	[1]	$ 1.37	[1]	$ 0.67	[1]	$ 6.22	$ 4.19	$ 3.76

[1] Net income per share attributable to the Company’s stockholders for the four quarters of each fiscal year may not sum to the total for the fiscal year because of the different number of shares outstanding during each period.