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Income (Loss) per Share - Basic and Diluted Loss Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net income (loss)	$ (27,761)	$ 14,740		$ (59,522)	$ 26,925
Undistributed income allocated to participating securities	0	228		0	217
Net income (loss) attributable to common stockholders	$ (27,761)	$ 14,512		$ (59,522)	$ 26,708
Basic weighted-average common stock shares outstanding (in shares)	41,580	37,390		41,309	37,304
Dilutive effects of common stock equivalents (in shares)	0	10		0	27
Diluted weighted-average common stock shares outstanding (in shares)	41,580	37,400		41,309	37,331
Income (loss) per common share, basic (USD per share)	$ (0.67)	$ 0.39		$ (1.44)	$ 0.72
Income (loss) per common share, diluted (USD per share)	$ (0.67)	$ 0.39		$ (1.44)	$ 0.72
Warrant
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		587	352	693
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	6,400			2,300
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	463	587		448	303
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)	1,700	10		1,700	27

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