Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net (Loss) to Common Stockholders, Basic EPS	$ (22,267)	$ (5,150)
Net (Loss) Income to Common Stockholders, Diluted EPS	$ (22,267)	$ (5,150)
Average Shares, Basic EPS	98,537	98,185
Average Shares, Diluted EPS	98,537	98,185
Loss per Share, Basic EPS	$ (0.23)	$ (0.05)
Loss per Share, Diluted EPS	$ (0.23)	$ (0.05)