Earnings Per Share Reconciliation - Schedule of Earnings Per Common Share Reconciliation (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings per common share:
Net earnings	$ 59,058	$ 51,179	$ 104,618	$ 115,072
Less: Net earnings allocated to restricted stock	398	239	650	547
Net earnings allocated to common shareholders	$ 58,660	$ 50,940	$ 103,968	$ 114,525
Weighted average shares outstanding	139,748	135,286	140,467	135,235
Basic earnings per common share	$ 0.42	$ 0.38	$ 0.74	$ 0.85
Diluted earnings per common share:
Net income allocated to common shareholders	$ 58,660	$ 50,940	$ 103,968	$ 114,525
Weighted average shares outstanding	139,748	135,286	140,467	135,235
Incremental shares from assumed exercise of outstanding options	305	221	263	235
Diluted weighted average shares outstanding	140,053	135,507	140,730	135,470
Diluted earnings per common share	$ 0.42	$ 0.38	$ 0.74	$ 0.85