Summary of Significant Accounting Policies - Computation of Basic EPS to Dilutive EPS (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net earnings per share, basic, Net Earnings	$ 227,562	$ 202,034	$ 164,812
Net earnings per share, diluted, Net Earnings	$ 227,562	$ 202,034	$ 164,812
Net earnings per share, basic, Weighted Average Shares	142,291,939	142,032,420	135,647,354
Effect of stock options and stock grants, Weighted Average Shares	842,281	512,571	698,665
Net earnings per share, diluted, Weighted Average Shares	143,134,220	142,544,991	136,346,019
NET EARNINGS PER SHARE, BASIC	$ 1.60	$ 1.42	$ 1.22
Effect of stock options and stock grants, Per Share Amount	(0.01)		(0.01)
Net earnings per share, diluted, Per Share Amount	$ 1.59	$ 1.42	$ 1.21