Earnings Per Share Disclosure [Line Items]

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- Definition

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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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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- Definition

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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- Definition

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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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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- Definition

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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- Definition

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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- Definition

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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- Definition

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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Reconciliation of Weighted Average Shares Used in Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 03, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities, Options, warrants,unvested restricted stock grants and unvested performance stock grants									$ 0	$ 0
Income (loss) attributable to common stockholders									(83,085)	1,243	$ 23,254
Income (loss) attributable to common stockholders plus assumed exercises and conversion									$ (83,085)	$ 1,243	30,639
Effect of dilutive securities, assumed conversion of convertible senior notes											$ 7,385
Earnings per share - basic, Weighted Average Shares
Weighted Average Shares, attributable to common stockholders	22,799	22,772	21,616	18,104	16,098	16,044	16,402	17,218	21,341	16,542	19,435
Effect of dilutive securities:
Assumed conversion of convertible senior notes											23,369
Options and warrants									0	0	0
Earnings per share - diluted, Weighted Average Shares
Income (loss) attributable to common stockholders plus assumed exercises and conversion, weighted average shares	22,799	22,772	21,616	18,104	16,098	39,504	16,402	17,218	21,341	16,665	43,321
Earnings per share - basic
Net income (loss) attributable to common stockholders, per-share	$ (1.33)	$ (0.77)	$ (0.77)	$ (1.01)	$ (0.47)	$ 1.91	$ (0.27)	$ (1.01)	$ (3.89)	$ 0.08	$ 1.20
Earnings per share - diluted
Income (loss) attributable to common stockholders plus assumed exercises and conversion, per-share	$ (1.33)	$ (0.77)	$ (0.77)	$ (1.01)	$ (0.47)	$ 0.82	$ (0.27)	$ (1.01)	$ (3.89)	$ 0.07	$ 0.71
Performance Stock
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities, Options, warrants,unvested restricted stock grants and unvested performance stock grants									$ 0	$ 0	$ 0
Unvested stock grants											347
Effect of dilutive securities:
Unvested stock grants											347
Restricted Stock
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities, Options, warrants,unvested restricted stock grants and unvested performance stock grants									$ 0	$ 0	$ 0
Unvested stock grants										123	170
Effect of dilutive securities:
Unvested stock grants										123	170
Options and Warrants
Earnings Per Share Disclosure [Line Items]
Effect of dilutive securities, Options, warrants,unvested restricted stock grants and unvested performance stock grants											$ 0