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Net Income Per Common Share - Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share Reconciliation [Abstract]
Income available to common stockholders	$ 20,730	$ 34,167	$ 43,338	$ 66,004
Income available to common stockholders plus assumed exercises of stock options	$ 20,730	$ 34,167	$ 43,338	$ 66,004
Income available to common stockholders - Shares	32,651,262	32,629,146	32,665,425	32,620,819
Dilutive effect of stock options - Shares	424,231	688,047	531,966	685,610
Income available to common stockholders plus assumed exercises of stock options - Shares	33,075,493	33,317,193	33,197,391	33,306,429
Income available to common stockholders - Per Share Amount	$ 0.64	$ 1.04	$ 1.33	$ 2.02
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount	$ 0.63	$ 1.02	$ 1.31	$ 1.98

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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