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	Dec. 31, 2014
Earnings Per Share [Abstract]
Options to purchase shares, contingently issuable shares, and common stock warrants excluded from diluted net income per share computation	3,600,000	3,100,000	4,000,000	3,200,000
Common stock outstanding	118,258,853		118,258,853		115,637,804