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Computation of Basic and Diluted Earnings Per Common Share (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income from Continuing Operations:                      
Income from continuing operations-basic $ 28,713 $ 34,936 $ 21,786 $ 40,470 $ 29,015 $ 21,492 $ 6,298 $ 17,654 $ 77,247 $ 63,747 $ 41,957
Net Income (Loss) Attributable to Noncontrolling Interest, Operating Partnerships (Deprecated 2013-01-31)                 (9,706) (5,067) (3,105)
Net Income Available for Common Shares-Fully Diluted:                      
Net income available for Common Shares-basic                 106,919 54,779 22,775
Amounts allocated to dilutive securities                 9,706 5,067 5,906
Net income available for Common Shares-fully diluted                 116,625 59,846 28,681
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent                 44,569 9,818 497
Redeemable Preferred Stock Dividends                 (9,280) (14,613) (13,823)
Denominator:                      
Weighted average Common Shares outstanding-basic 83,003 83,021 83,021 83,026 82,569 82,380 82,262 82,176 83,018 82,348 71,182
Effect of dilutive securities:                      
Redemption of Common OP Units for Common Shares                 7,549 7,877 8,520
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock                 0 0 306
Employee stock options and restricted shares                 629 637 652
Weighted average Common Shares outstanding-fully diluted 91,334 91,259 91,128 91,060 90,944 90,894 90,780 90,738 91,196 90,862 80,660
Income (Loss) from Continuing Operations, Per Basic Share                 $ 0.75 $ 0.55 $ 0.31
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share                 $ 0.54 $ 0.12 $ 0.01
Net income available for Common Shares $ 0.29 $ 0.36 $ 0.22 $ 0.42 $ 0.29 $ 0.19 $ 0.03 $ 0.15 $ 1.29 $ 0.67 $ 0.32
Income (Loss) from Continuing Operations, Per Diluted Share                 $ 0.75 $ 0.54 $ 0.31
Net income available for Common Shares $ 0.29 $ 0.36 $ 0.21 $ 0.42 $ 0.29 $ 0.19 $ 0.02 $ 0.15 $ 1.28 $ 0.66 $ 0.32
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share                 $ 0.53 $ 0.12 $ 0.01
Continuing Operations [Member]
                      
Income from Continuing Operations:                      
Net Income (Loss) Attributable to Noncontrolling Interest, Operating Partnerships (Deprecated 2013-01-31)                 (5,617) (4,173) (5,856)
Net Income Available for Common Shares-Fully Diluted:                      
Net income available for Common Shares-basic                 62,350 44,961 22,278
Amounts allocated to dilutive securities                 5,617 4,173 3,105
Net income available for Common Shares-fully diluted                 67,967 49,134 25,383
Cumulative Series C Six Point Seven Five Percent Redeemable Perpetual Preferred Stock [Member]
                      
Net Income Available for Common Shares-Fully Diluted:                      
Redeemable Preferred Stock Dividends                 $ (9,280) $ (2,909) $ 0