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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
Stock Options
Computation Of Earnings Per Share Line Items
Anti-dilutive shares excluded from the computation of diluted earnings per share	139,000	255,000	139,000
Restricted Stock
Computation Of Earnings Per Share Line Items
Anti-dilutive shares excluded from the computation of diluted earnings per share	374,497	319,001	374,497

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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