Summary of Treasury Stock Activity (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Treasury Stock, Shares [Abstract]
Beginning Balance, Shares		5,050,981	4,711,859	4,626,191
Restricted stock withholdings	[1]	237,416	264,522	59,060
Restricted stock forfeitures	[2]	61,714	74,600	26,608
Ending Balance, Shares		5,350,111	5,050,981	4,711,859
Beginning Balance, Cost		$ 87,004	$ 81,567	$ 79,259
Restricted stock withholdings	[1]	4,102	5,437	2,308
Restricted stock forfeitures	[2]	0	0	0
Ending Balance, Cost		$ 91,106	$ 87,004	$ 81,567

[1] The Company withheld restricted shares as a result of the election by certain employees to satisfy their tax liabilities upon vesting in restricted stock and restricted stock units. The Company determined the number of shares to be withheld based upon market values that ranged from $36.81 to $40.32 during the year ended December 31, 2019, $8.03 to $32.12 during the year ended December 31, 2020 and $15.21 to $24.14 during the year ended December 31, 2021.

[2] The Company repurchased forfeited restricted shares at a cost of $0.001 per share in accordance with the 2017 Omnibus Plan.