Capital Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Authorized capital stock	300,000,000
Common stock, par value	$ 0.01
Preferred stock, par value	$ 15,000,000
Authorized preferred stock	0.01
Number of acquired treasury shares	21,685	15,679	3,785,658
Value of acquired treasury shares	$ 96	$ 156	$ 40,197