Stock Repurchase - Additional Information (Detail) - shares		3 Months Ended	6 Months Ended
	Jul. 28, 2017	Mar. 31, 2017	Jun. 30, 2017	Jul. 25, 2017
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program expiration date		Sep. 30, 2017	Sep. 30, 2020
Minimum number of shares that company is required to repurchase			0
Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, number of shares authorized to be repurchased			1,500,000
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchased under authorization	0
Subsequent Event [Member] | Maximum [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, number of shares authorized to be repurchased				2,000,000