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
		Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net (loss) income		$ (188,593)	$ 16,530
Denominator for basic earnings per share - weighted average shares		36,644	36,593
Effect of dilutive securities: Employee stock options and restricted stock	[1]		282
Denominator for diluted earnings per share - Adjusted weighted average shares and the effect of dilutive securities		36,644	36,875
Net (loss) income per share - basic		$ (5.15)	$ 0.45
Net (loss) income per share - diluted	[2]	$ (5.15)	$ 0.45

[1] The effect of dilutive securities for employee stock options and restricted stock in the quarter ended March 31, 2017 was affected by the adoption of ASU 2016-09 in the period. In accordance with the standard, the effect of dilutive securities in the calculation of diluted net income per share was applied prospectively and results for the quarter ended March 31, 2016 have not been revised.

[2] As a result of the net loss in the three months ended March 31, 2017, the effect of potentially dilutive securities would have been anti-dilutive and has been omitted from the calculation of diluted earnings per share.