Weighted Average Common Shares - Summary of Weighted Average Numbers of Common Shares Used to Compute Basic and Diluted Net Income (Loss) Per Share (Detail) - shares shares in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2016	[1]	Sep. 30, 2015	[1]	Sep. 30, 2016	Sep. 30, 2015	[1]
Earnings Per Share [Abstract]
Basic common shares outstanding	68,460		67,961		68,328	67,798
Common stock equivalents					561
Diluted common shares outstanding	68,460		67,961		68,889	67,798

[1] Due to the fact that we reported a loss from continuing operations for the quarters ended September 30, 2015 and 2016, and year to date ended September 30, 2015, potential common stock equivalents are excluded from the diluted common shares outstanding calculation. Per FASB ASC Topic 260 – Earnings Per Share, an entity that reports discontinued operations shall use income or loss from continuing operations as the benchmark for calculating diluted common shares outstanding, and as such, we have zero common stock equivalents since these shares would have an anti-dilutive effect on our net loss per share for the quarters ended September 30, 2015 and 2016, and year to date ended September 30, 2015.