Stock-Based Compensation - Performance-Based Restricted Stock Activity (Detail) - Performance-Based Restricted Stock and Performance-Based Restricted Stock Units [Member] - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Restricted Stock Activity [Line Items]
Nonvested, Shares, Beginning Balance	72,570	123,656	182,412
Performance-based Restricted Stock, Granted	36,522	78,404	164,270
Performance-based Restricted Stock, Vested	(45,051)	(128,762)	(222,004)
Performance-based Restricted Stock, Forfeited	(6,273)	(728)	(1,022)
Nonvested, Shares, Ending Balance	57,768	72,570	123,656
Nonvested, Weighted-Average Grant Price Per Share, Beginning Balance	$ 43.42	$ 30.67	$ 18.43
Weighted-Average Grant Price Per Share, Granted	86.26	39.60	23.82
Weighted-Average Grant Price Per Share, Vested	39.41	28.87	15.55
Weighted-Average Grant Price Per Share, Forfeited	65.30	41.12	29.23
Nonvested, Weighted-Average Grant Price Per Share, Ending Balance	$ 71.21	$ 43.42	$ 30.67