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Earnings Per Share - Additional Information (Detail)	3 Months Ended		6 Months Ended
Earnings Per Share - Additional Information (Detail)	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Earnings Per Share [Abstract]
Options to purchase shares, restricted share awards, common stock warrants and contingently issuable shares excluded from diluted earnings (loss) per share computation	1,600,000	6,700,000	3,700,000	6,900,000
Common stock outstanding	39,568,183		39,568,183		39,447,773

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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