Earnings Per Share Note [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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- Definition

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

Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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- Definition

Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share Note [Line Items]
Effect of dilutive securities, Options, warrants,unvested restricted stock grants and unvested performance stock grants									$ 0		$ 0
Income available to common stockholders									1,243	$ 23,254	21,509
Income available to common stockholders plus assumed exercises and conversion									$ 1,243	30,639	28,854
Effect of dilutive securities, assumed conversion of convertible senior notes										$ 7,385	$ 7,345
Earnings per share - basic, Weighted Average Shares
Weighted Average Shares, available to common stockholders	16,098	16,044	16,402	17,218	18,781	18,559	19,108	19,090	16,542	19,435	20,948
Effect of dilutive securities:
Assumed conversion of convertible senior notes										23,369	20,388
Options and warrants									0	0	0
Earnings per share - diluted, Weighted Average Shares
Income available to common stockholders plus assumed exercises and conversion, weighted average shares	16,098	39,504	16,402	17,218	18,781	42,562	19,108	19,090	16,665	43,321	41,516
Earnings per share - basic
Net income available to common stockholders, per-share	$ (0.47)	$ 1.91	$ (0.27)	$ (1.01)	$ (0.50)	$ 2.47	$ (0.30)	$ (0.40)	$ 0.08	$ 1.20	$ 1.03
Earnings per share - diluted
Income available to common stockholders plus assumed exercises and conversion, per-share	$ (0.47)	$ 0.82	$ (0.27)	$ (1.01)	$ (0.50)	$ 1.12	$ (0.30)	$ (0.40)	$ 0.07	$ 0.71	$ 0.70
Restricted Stock
Earnings Per Share Note [Line Items]
Effect of dilutive securities, Options, warrants,unvested restricted stock grants and unvested performance stock grants									$ 0	$ 0
Effect of dilutive securities:
Unvested stock grants									123	170	180
Performance Stock
Earnings Per Share Note [Line Items]
Effect of dilutive securities, Options, warrants,unvested restricted stock grants and unvested performance stock grants									$ 0	$ 0
Effect of dilutive securities:
Unvested stock grants										347
Options and Warrants
Earnings Per Share Note [Line Items]
Effect of dilutive securities, Options, warrants,unvested restricted stock grants and unvested performance stock grants										$ 0	$ 0