Earnings Per Share - Schedule of Diluted Shares (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule of Diluted Shares
Basic weighted average shares outstanding	57,304,763	56,600,866	57,040,166	57,464,763
Dilutive shares	563,540	514,748	535,139	735,445
Total diluted weighted-average shares outstanding	57,867,303	57,115,614	57,575,305	58,200,208