XML 48 R89.htm IDEA: XBRL DOCUMENT v3.20.1
Share-based Compensation - Summary of Additional RSU Information (Detail) - USD ($)
$ / shares in Units, $ 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]      
Fair value of RSUs that vested  
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date fair value per unit $ 27.89 $ 28.25 $ 19.99
Fair value of RSUs that vested $ 916