Stockholders' Equity - Additional Information (Detail) - $ / shares	1 Months Ended	3 Months Ended
	Jul. 27, 2017	Jun. 30, 2017
Equity Class Of Treasury Stock [Line Items]
Repurchase of shares		20,000
Shares repurchased average price		$ 94.03
Subsequent Event [Member]
Equity Class Of Treasury Stock [Line Items]
Repurchase of shares	65,000
Shares repurchased average price	$ 92.74
Stock repurchase remaining number of shares authorized to be repurchased	4,712,200