Share-Based Compensation - Components of Share-Based Compensation Expense by Type of Award (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 2,822	$ 2,416	$ 5,496
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	881	678	1,078
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	1,897	1,630	1,968
Performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	1,155	2,076	2,450
Change in Estimate of Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ (1,111)	$ (1,968)	$ 0