Earnings per Share (Detail)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of shares for calculation of basic EPS - Common Stock	31,606,986	24,461,056
Impact of stock options outstanding under the 1997, 2006 and 2011 Stock Option Plans	476,563	689,587
Weighted average number of shares for calculation of diluted EPS	32,083,549	25,150,643
Common stock that have been excluded from the diluted shares calculation	1,034,021	3,268,918
Stock options outstanding under the 2006 and 2011 Stock Option Plans
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock that have been excluded from the diluted shares calculation	124,000	84,000
Series C Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock that have been excluded from the diluted shares calculation	910,021	3,184,918

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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+ Details

- 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.

+ References+ Details

- Definition

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.

+ References

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+ Details