Net Income (Loss) Per Share - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Line Items]
Exercisable options outstanding that enable to purchase shares	800,000	900,000
Restricted Stock [Member]
Earnings Per Share [Line Items]
Shares with dilutive effect and included in computation of diluted income (loss) per share		17,000	100,000
Equity Option [Member]
Earnings Per Share [Line Items]
Shares with dilutive effect and included in computation of diluted income (loss) per share	298,000	145,000
Options excluded from computation of diluted income (loss) per share due to anti-dilutive effect	295,000	412,000	1,600,000