Stock Repurchases - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2017	Apr. 04, 2017
Equity [Abstract]
Number of shares repurchased during the period		0.8
Repurchased average price per share		$ 36.39
Shares repurchased, value		$ 29,000,000
Expansion of share repurchase program	$ 50,000,000
Total amount authorized under the share repurchase program		400,000,000
Common stock additional repurchases under authorized repurchase program		$ 80,500,000