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Equity - Common Share Dividends Declared Per Share (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Schedule Of Capitalization Equity [Line Items]        
Common share dividends declared per share $ 0.155 $ 0.135 $ 0.31 $ 0.27