Shareholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended
	Oct. 31, 2016	Dec. 31, 2019	Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, authorized amount		$ 0	$ 0
October 2016 Share Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Share repurchase program, authorized amount		$ 100
Stock repurchase program, period in force	3 years