Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Weighted average common shares outstanding, basic	65,335,457	64,059,675	64,540,034	64,038,526
Weighted average common shares outstanding, diluted	65,501,697	64,304,985	64,736,155	64,302,615