Summary of Significant Accounting Policies - Computation of Basic EPS to Dilutive EPS (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net earnings per share, basic, Net Earnings	$ 55,972	$ 56,918
Net earnings per share, diluted, Net Earnings	$ 55,972	$ 56,918
Net earnings per share, basic, Weighted Average Shares	142,558,743	142,146,275
Effect of stock options and stock grants, Weighted Average Shares	743,320	856,383
Net earnings per share, diluted, Weighted Average Shares	143,302,063	143,002,658
Net earnings per share, basic, Per Share Amount	$ 0.39	$ 0.40
Net earnings per share, diluted, Per Share Amount	$ 0.39	$ 0.40