Shareholders' Equity - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Aug. 31, 2015
Stockholders Equity Note [Abstract]
Common stock shares authorized for repurchase				2,000,000
Shares remain authorized for repurchase	1,592,026
Common stock repurchased, Shares	0	0	0