Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	May 03, 2017	Apr. 18, 2017	Mar. 31, 2017	May 18, 2017
Subsequent Event [Line Items]
Dividend declaration date			Apr. 18, 2017
Dividend record date			May 04, 2017
Dividend payment date			May 18, 2017
Stock repurchased, shares			300,000
Shares repurchased, average price per share			$ 21.44
Additional shares authorized for purchase			4,200,000
Scenario Forecast [Member]
Subsequent Event [Line Items]
Quarterly dividend payable subsequent to balance sheet date				$ 4.3
Subsequent Events [Member]
Subsequent Event [Line Items]
Common stock dividends per share declared		$ 0.09
Stock repurchased, shares	50,000
Shares repurchased, average price per share	$ 19.91
Additional shares authorized for purchase	4,100,000