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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								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share Reconciliation [Abstract]
Income available to common stockholders									$ 134,879	$ 125,814	$ 86,439
Income available to common stockholders plus assumed exercises of stock options									$ 134,879	$ 125,814	$ 86,439
Income available to common stockholders - Shares									32,639,396	32,689,228	31,813,572
Effect of stock options - Shares									690,448	741,486	754,533
Income available to common stockholders plus assumed exercises of stock options - Shares									33,329,844	33,430,714	32,568,105
Income available to common stockholders - Per Share Amount	$ 1.09	$ 1.02	$ 1.04	$ 0.98	$ 1.00	$ 1.01	$ 0.93	$ 0.91	$ 4.13	$ 3.85	$ 2.72
Income available to common stockholders plus assumed exercises of stock options - Per Share Amount	$ 1.07	$ 1.00	$ 1.02	$ 0.96	$ 0.98	$ 0.98	$ 0.91	$ 0.89	$ 4.05	$ 3.76	$ 2.65

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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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