Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net (loss) income		$ (97)	$ 5,096	$ (51,537)	$ (183,498)
Denominator for basic earnings per share - weighted average shares		36,925	36,673	36,895	36,659
Effect of dilutive securities: Employee stock options and restricted stock			200
Denominator for diluted earnings per share - Adjusted weighted average shares and the effect of dilutive securities		36,925	36,873	36,895	36,659
Net loss per share - basic		$ 0.00	$ 0.14	$ (1.40)	$ (5.01)
Net loss per share - diluted	[1]	$ 0.00	$ 0.14	$ (1.40)	$ (5.01)

[1] As a result of the net loss in the three and six months ended June 30, 2018, and the six months ended June 30, 2017, the effect of potentially dilutive securities would have been anti-dilutive and have been omitted from the calculation of diluted earnings per share.