Net Income (Loss) Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Diluted computation increased	0	77,000	0	71,000
Share-based awards outstanding under equity plans	3,500,000	4,100,000	3,500,000	4,100,000
Option Plans [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Diluted computation increased				1,800,000