Common Stock Repurchase Programs - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Jan. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 25, 2016
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased			$ 5,014,000	$ 20,719,000
2016 Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Amount authorized to be repurchased	$ 50,000,000
Common stock repurchased	15,400,000
Remaining Amount authorized to be repurchased	$ 34,600,000
Stock repurchased during period, shares		0