Reconciliation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 102,846	$ 26,592	$ 190,349	$ 43,822
Weighted average shares outstanding - basic	33,651	33,428	33,647	33,423
Dilutive effect of restricted stock	284	451	303	404
Weighted average shares outstanding - diluted	33,935	33,879	33,950	33,827
Earnings per share - basic	$ 3.06	$ 0.80	$ 5.66	$ 1.31
Earnings per share - diluted	$ 3.03	$ 0.78	$ 5.61	$ 1.30