Earnings Per Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Options to purchase shares, contingently issuable shares, and common stock warrants excluded from diluted net income per share computation	3,700,000	2,900,000	4,500,000
Common stock outstanding	119,033,770	115,637,804