Earnings Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Anti-dilutive securities excluded from computation of diluted shares	0.7	1.5
Common stock repurchase, authorized amount		$ 100,000,000
Common stock repurchased during period, shares		2.0
Weighted average repurchase price		$ 12.22
Aggregate stock repurchase price	$ 16,000	$ 24,762,000
Cash settled for repurchase of common stock		$ 18,000,000
Percentage of repurchase of common stock		1.60%
Common stock repurchase, remaining authorized repurchase amount		$ 75,300,000