Computation of Basic and Diluted Earnings Per Common Share (Detail) (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Income from Continuing Operations:
Income from continuing operations - basic	$ 6,827	$ 6,047	$ 25,787	$ 21,263
Amounts allocated to dilutive securities	789	935	3,410	3,392
Income from continuing operations - fully diluted	7,616	6,982	29,197	24,655
Income from Discontinued Operations:
Loss from discontinued operations - basic		(47)		(199)
Amounts allocated to dilutive securities		(7)		(32)
Loss from discontinued operations - fully diluted		(54)		(231)
Net Income Available for Common Shares - Fully Diluted:
Net income available for Common Shares - basic	6,827	6,000	25,787	21,064
Amounts allocated to dilutive securities	789	928	3,410	3,360
Net income available for Common Shares - fully diluted	$ 7,616	$ 6,928	$ 29,197	$ 24,424
Denominator:
Weighted average Common Shares outstanding - basic	32,629	30,412	31,817	30,358
Effect of dilutive securities:
Redemption of Common OP Units for Common Shares	4,312	4,829	4,324	4,871
Employee stock options and restricted shares	321	265	300	242
Weighted average Common Shares outstanding - fully diluted	37,262	35,506	36,441	35,471
Earnings per Common Share - Basic:
Income from continuing operations	$ 0.21	$ 0.20	$ 0.81	$ 0.70
Loss from discontinued operations				$ (0.01)
Net income available for Common Shares	$ 0.21	$ 0.20	$ 0.81	$ 0.69
Earnings per Common Share - Fully Diluted:
Income from continuing operations	$ 0.20	$ 0.20	$ 0.80	$ 0.70
Loss from discontinued operations				$ (0.01)
Net income available for Common Shares	$ 0.20	$ 0.20	$ 0.80	$ 0.69

Net income (loss) from continuing operations, excluding effect of minority interest expense, apportioned to common stockholders.

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