Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Weighted average common shares outstanding, basic	66,100,089	66,016,562	66,086,817	65,995,560
Weighted average common shares outstanding, diluted	66,344,943	66,138,275	66,362,191	66,153,579