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Capital (Tables) | 6 Months Ended
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Jun. 30, 2015
Stockholders' Equity Note Disclosure, Disclosure of Compensation Related Costs, Share-based Payments and Earnings Per Share [Abstract] |
Summary of Restricted Stock and Long-Term Incentive Plan Activity | The following is a summary of ESRT restricted stock and LTIP unit activity for the six months ended June 30, 2015:
| Restricted Stock |  | LTIP Units |  | Weighted Average Grant Price
Unvested balance at December 31, 2014 | 102,296 |  |  | 1,194,660 |  |  | $ | 13.78 |
Vested | (6,261 | ) |  | (59,875 | ) |  | 15.03 |
Granted | 30,020 |  |  | 461,180 |  |  | 18.11 |
Forfeited | (6,397 | ) |  | (1,108 | ) |  | 15.29 |
Unvested balance at June 30, 2015 | 119,658 |  |  | 1,594,857 |  |  | $ | 14.96 |
Schedule of Earnings Per Unit, Basic and Diluted | Earnings per unit for the three and six months ended June 30, 2015 and 2014 is computed as follows (amounts in thousands, except per unit amounts):
| Three Months Ended |  | Six Months Ended
| June 30, 2015 |  | June 30, 2014 |  | June 30, 2015 |  | June 30, 2014
Numerator: |  |  |  |  |  |  |
Net income | 26,585 |  |  | 25,281 |  |  | 34,473 |  |  | 36,512 |
Private perpetual preferred unit distributions | (234 | ) |  | — |  |  | (468 | ) |  | — |
Earnings allocated to unvested units | (161 | ) |  | (108 | ) |  | (284 | ) |  | (247 | )
Net income attributable to common unitholders - basic and diluted | $ | 26,190 |  |  | $ | 25,173 |  |  | $ | 33,721 |  |  | $ | 36,265 |
Denominator - |  |  |  |  |  |  |
Weighted average units outstanding - basic and diluted | 265,867 |  |  | 244,436 |  |  | 265,866 |  |  | 244,431 |
Earnings per unit - basic and diluted | $ | 0.10 |  |  | $ | 0.10 |  |  | $ | 0.13 |  |  | $ | 0.15 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + 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://www.xbrl.org/2003/role/presentationRef -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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