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Unaudited Pro Forma Consolidated Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Business Acquisition, Pro Forma Information [Line Items]
Total revenues	$ 676,819
Net income available for Common Shares	$ 17,441
Earnings per Common Share - Basic	$ 0.45
Earnings per Common Share - Fully Diluted	$ 0.44

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details