Earnings Per Share - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2015
Earnings Per Share [Abstract]
Anti-dilutive securities excluded from computation of diluted shares		800,000	0
Common stock repurchase, authorized amount				$ 100,000,000
Common stock repurchased during period, shares	6,300,000
Weighted average repurchase price	$ 15.89
Aggregate stock repurchase price	$ 100,100,000
Percentage of repurchase of common stock	5.00%