Income (Loss) per Share - Basic and Diluted Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net income (loss)	$ 27,786	$ (18,673)
Undistributed income allocated to participating securities	299	0
Numerator for diluted income (loss) per common share	27,487	(18,673)
Plus: Net income effect of convertible securities	2,509	0
Numerator for diluted income (loss) per common share	$ 29,996	$ (18,673)
Basic weighted-average common stock shares outstanding (in shares)	45,476	40,974
Dilutive effects of common stock equivalents (in shares)	6,389	0
Diluted weighted-average common stock shares outstanding (in shares)	51,865	40,974
Income (loss) per common share, basic (USD per share)	$ 0.60	$ (0.46)
Income (loss) per common share, diluted (USD per share)	$ 0.58	$ (0.46)
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average number of shares issuable under the common stock warrants (in shares)	352	345
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	2,000	658
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	120	439

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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