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Reconciliation of Weighted Average Shares Used in Computation of Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share Disclosure [Line Items]
Income (loss) attributable to common stockholders	$ 15,682	$ (17,614)	$ (39,121)	$ (52,672)
Effect of dilutive securities, convertible senior notes	1,487
Net income (loss) available to common stockholders plus assumed exercises and conversion	$ 17,169	$ (17,614)	$ (39,121)	$ (52,672)
Weighted Average Shares, attributable to common stockholders	23,106	22,772	23,104	20,848
Effect of dilutive securitiess
Convertible senior notess	21,426
Earnings per share - diluted, Weighted Average Shares
Net Income (loss) attributable to common stockholders plus assumed exercises and conversion, weighted average shares	45,686	22,772	23,104	20,848
Income (loss) per share - basic
Net income (loss) available to common stockholders	$ 0.68	$ (0.77)	$ (1.69)	$ (2.53)
Income (loss) per share - diluted
Net Income (loss) attributable to common stockholders plus assumed exercises and conversion, per-share	$ 0.38	$ (0.77)	$ (1.69)	$ (2.53)
Performance Stock
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities, unvested restricted stock grants and unvested performance stock grants	$ 0	$ 0	$ 0	$ 0
Effect of dilutive securitiess
Unvested stock grants	832
Restricted Stock
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities, unvested restricted stock grants and unvested performance stock grants	$ 0	$ 0	$ 0	$ 0
Effect of dilutive securitiess
Unvested stock grants	322

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