Reconciliation of Weighted Average Shares Used in Computation of Earnings (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share Disclosure [Line Items]
Net income (loss) available to common stockholders	$ (17,614)	$ 30,612	$ (52,672)	$ 8,828
Effect of dilutive securities, convertible senior notes		1,840		5,557
Net income (loss) available to common stockholders plus assumed exercises and conversion	$ (17,614)	$ 32,452	$ (52,672)	$ 14,385
Earnings (loss) per share - basic, Weighted Average Shares
Weighted Average Shares, available to common stockholders	22,772	16,044	20,848	16,561
Effect of dilutive securities:
Convertible senior notes		23,081		23,123
Earnings (loss) per share - diluted, Weighted Average Shares
Net income (loss) available to common stockholders plus assumed exercises and conversion	22,772	39,504	20,848	39,916
Earnings (loss) per share - basic
Net income (loss) available to common stockholders	$ (0.77)	$ 1.91	$ (2.53)	$ 0.53
Earnings (loss) per share - diluted
Net income (loss) available to common stockholders	$ (17,614)	$ 30,612	$ (52,672)	$ 8,828
Effect of dilutive securities, convertible senior notes		1,840		5,557
Net income (loss) available to common stockholders plus assumed exercises and conversion	$ (17,614)	$ 32,452	$ (52,672)	$ 14,385
Net income (loss) available to common stockholders plus assumed exercises and conversion	$ (0.77)	$ 0.82	$ (2.53)	$ 0.36
Performance Stock
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities, unvested stock grants	$ 0	$ 0	$ 0	$ 0
Effect of dilutive securities:
Unvested stock grants		164		115
Earnings (loss) per share - diluted
Effect of dilutive securities, unvested stock grants	0	$ 0	0	$ 0
Restricted Stock
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities, unvested stock grants	0	$ 0	0	$ 0
Effect of dilutive securities:
Unvested stock grants		215		117
Earnings (loss) per share - diluted
Effect of dilutive securities, unvested stock grants	$ 0	$ 0	$ 0	$ 0

Earnings Per Share Disclosure [Line Items]

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Effect of Dilutive Securities Convertible Senior Notes

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs).

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities, and addition from assumption of issuance of common shares for dilutive potential common shares; of income (loss) available to common shareholders.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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