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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
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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

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