Shared-Based Compensation - Components of Share-Based Compensation Expense by Type of Award (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 1,411	$ 1,106	$ 2,707	$ 1,979
Stock Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	140	169	321	361
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	936	502	1,828	961
Performance Based Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 335	$ 435	$ 558	$ 657