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Net Income Per Common Share - Basic and Diluted Net Income Per Common Share Based on Weighted-average Shares Outstanding (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share Reconciliation [Abstract]
Income available to common stockholders	$ 33,368	$ 32,883	$ 99,372	$ 93,089
Income available to common stockholders plus assumed exercises of stock options	$ 33,368	$ 32,883	$ 99,372	$ 93,089
Income available to common stockholders - Shares	32,641,902	32,742,480	32,627,924	32,678,310
Dilutive effect of stock options - Shares	685,311	761,663	686,374	752,451
Income available to common stockholders plus assumed exercises of stock options - Shares	33,327,213	33,504,143	33,314,298	33,430,761
Income available to common stockholders - Per Share Amount	$ 1.02	$ 1.01	$ 3.04	$ 2.85
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount	$ 1.00	$ 0.98	$ 2.98	$ 2.78

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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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