Share Repurchase Plan - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended
	Jul. 29, 2016	Jun. 30, 2016	Dec. 31, 2015
Equity Class Of Treasury Stock [Line Items]
Share repurchase program, authorized amount			$ 75,000,000
Common stock repurchased, shares		403,688
Common stock repurchased, amount		$ 17,400,000
Common stock repurchased, price per share		$ 43.16
Share repurchase program, remaining authorized amount		$ 19,500,000
Subsequent Event [Member]
Equity Class Of Treasury Stock [Line Items]
Common stock repurchased, shares	45,108
Common stock repurchased, amount	$ 2,100,000