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Earnings Per Share - Computation of Company's Earnings Per Share (EPS) and Reconciliation of Net Income (Loss) from Continuing Operations and Number of Common Shares Used in Computations of "Basic" EPS and "Diluted" EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Continuing Operations: |  |  |  |  |  |  |  |  |  |  |
(Loss) income from continuing operations |  |  |  |  |  |  |  |  | $ (237,881) | $ 21,107 | $ 21,419
Plus: Gain on disposition of real estate |  |  |  |  |  |  |  |  | 167,571 | 3,060 | 467
Plus: (Income) loss attributable to non-controlling interests |  |  |  |  |  |  |  |  | (1,858) | 2,356 | (640)
Less: Write-off of preferred share original issuance costs |  |  |  |  |  |  |  |  | 0 | (1,943) | (5,246)
Less: Preferred dividends |  |  |  |  |  |  |  |  | (22,375) | (24,054) | (27,721)
Less: Earnings attributable to unvested shares and OP Units |  |  |  |  |  |  |  |  | (1,286) | (1,684) | (1,367)
Loss from continuing operations |  |  |  |  |  |  |  |  | (95,829) | (1,158) | (13,088)
Discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations |  |  |  |  |  |  |  |  | 0 | 89,398 | (31,267)
Plus: loss (income) attributable to non-controlling interests |  |  |  |  |  |  |  |  | 0 | 1,361 | (154)
Net (loss) income attributable to common shareholders after allocation to participating securities |  |  |  |  |  |  |  |  | $ (95,829) | $ 89,601 | $ (44,509)
Denominators – Number of Shares |  |  |  |  |  |  |  |  |  |  |
Basic and Diluted—Average shares outstanding |  |  |  |  |  |  |  |  | 360,946 | 358,122 | 326,426
Basic Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations attributable to common shareholders |  |  |  |  |  |  |  |  | $ (0.27) | $ 0.00 | $ (0.04)
Income (loss) from discontinued operations attributable to common shareholders |  |  |  |  |  |  |  |  | 0 | 0.25 | (0.10)
Net (loss) income attributable to common shareholders | $ 0.24 | $ 0.15 | $ 0.03 | $ (0.69) | $ (0.05) | $ 0.17 | $ 0.19 | $ (0.07) | (0.27) | 0.25 | (0.14)
Diluted Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations attributable to common shareholders |  |  |  |  |  |  |  |  | (0.27) | 0.00 | (0.04)
Income (loss) from discontinued operations attributable to common shareholders |  |  |  |  |  |  |  |  | 0 | 0.25 | (0.10)
Net (loss) income attributable to common shareholders | $ 0.24 | $ 0.15 | $ 0.03 | $ (0.69) | $ (0.05) | $ 0.17 | $ 0.19 | $ (0.07) | $ (0.27) | $ 0.25 | $ (0.14)

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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4613673-111683 + Details
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