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Capital (Tables) | 9 Months Ended
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Sep. 30, 2018
Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract] |
Summary of ERST Restricted Stock and LTIP Unit | The following is a summary of ESRT restricted stock and LTIP unit activity for the nine months ended September 30, 2018:
| Restricted Stock |  | LTIP Units |  | Weighted Average Grant Fair Value
Unvested balance at December 31, 2017 | 90,791 |  |  | 3,588,609 |  |  | $ | 11.20 |
Vested | (30,693 | ) |  | (492,877 | ) |  | 14.58 |
Granted | 39,608 |  |  | 2,719,801 |  |  | 8.54 |
Forfeited or unearned | (7,811 | ) |  | (103,490 | ) |  | 8.52 |
Unvested balance at September 30, 2018 | 91,895 |  |  | 5,712,043 |  |  | $ | 9.68 |
Earnings Per Unit | Earnings per unit for the three and nine months ended September 30, 2018 and 2017 is computed as follows (amounts in thousands, except per share amounts):
| Three Months Ended, |  | Nine Months Ended,
| September 30, 2018 |  | September 30, 2017 |  | September 30, 2018 |  | September 30, 2017
Numerator: |  |  |  |  |  |  |
Net income | $ | 29,230 |  |  | $ | 35,489 |  |  | $ | 77,472 |  |  | $ | 85,993 |
Private perpetual preferred unit distributions | (234 | ) |  | (234 | ) |  | (702 | ) |  | (702 | )
Earnings allocated to unvested units | (212 | ) |  | (228 | ) |  | (586 | ) |  | (582 | )
Net income attributable to common unitholders - basic and diluted | $ | 28,784 |  |  | $ | 35,027 |  |  | $ | 76,184 |  |  | $ | 84,709 |
Denominator: |  |  |  |  |  |  |
Weighted average units outstanding - basic | 297,478 |  |  | 296,389 |  |  | 297,180 |  |  | 296,389 |
Effect of dilutive securities: |  |  |  |  |  |  |
Stock-based compensation plans | — |  |  | 762 |  |  | 1 |  |  | 848 |
Exchangeable senior notes | — |  |  | 720 |  |  | — |  |  | 852 |
Weighted average units outstanding - diluted | 297,478 |  |  | 297,871 |  |  | 297,181 |  |  | 298,089 |
Earnings per share: |  |  |  |  |  |  |
Basic | $ | 0.10 |  |  | $ | 0.12 |  |  | $ | 0.26 |  |  | $ | 0.29 |
Diluted | $ | 0.10 |  |  | $ | 0.12 |  |  | $ | 0.26 |  |  | $ | 0.28 |

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- Definition Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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