Weighted Average Common Shares - Summary of Weighted Average Numbers of Common Shares Used to Compute Basic and Diluted Net (Loss) Income Per Share (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2016	[1]	Dec. 31, 2015	Dec. 31, 2014	[1]
Earnings Per Share [Abstract]
Basic common shares outstanding	68,373		67,860	67,173
Common stock equivalents			468
Diluted common shares outstanding	68,373		68,328	67,173

[1] Due to the fact that we reported a loss from continuing operations for the years ended December 31, 2016 and 2014, potential common stock equivalents were 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 years ended December 31, 2016 and 2014.