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Capital - Incentive and Share-based Compensation (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 USD ($) $ / shares shares | Feb. 28, 2015 USD ($) vesting_installment tranche shares | Jan. 31, 2015 USD ($) $ / shares shares | Jun. 30, 2015 USD ($) $ / shares shares | Mar. 31, 2015 $ / shares shares | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) $ / shares shares | Jun. 30, 2014 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expected volatility rate look-back period (in years) |  |  |  |  |  |  | 6 years |
Annual forfeiture rate, percent |  |  |  |  |  |  | 0.05 |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance, Unvested, Weighted Average Grant Price, per share | $ / shares |  |  | $ 13.78 |  | $ 13.78 |  | $ 13.78 |
Vested, Weighted Average Grant Price, per share | $ / shares |  |  |  |  |  |  | 15.03 |
Granted, Weighted Average Grant Price, per share | $ / shares |  |  |  |  |  |  | 18.11 |
Forfeited, Weighted Average Grant Price, per share | $ / shares |  |  |  |  |  |  | 15.29 |
Ending balance, Unvested, Weighted Average Grant Price, per share | $ / shares | $ 14.96 |  |  | $ 14.96 |  |  | $ 14.96 |
Age of grantee at which LTIP unit and restricted stock awards immediately vest |  |  |  |  |  |  | 60 years |
Period of service, upon completion of which, grantee's LTIP unit and restricted stock awards will immediately vest |  |  |  |  |  |  | 10 years |
Awards that Meet Age and Service Requirements for Vesting |  |  |  |  |  |  |  |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Noncash share-based compensation expense recognized | $ |  |  |  |  |  |  | $ 0.5 | $ 0.2
Unrecognized compensation expense | $ | $ 0.2 |  |  | $ 0.2 |  |  | 0.2 |
Unrecognized compensation expense, period for recognition (in years) |  |  |  |  | 1 year 8 months 12 days |  |  |
Awards that Do Not Meet Age and Service Requirements for Vesting |  |  |  |  |  |  |  |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Noncash share-based compensation expense recognized | $ |  |  |  | 1.2 |  | $ 1.0 | 2.4 | $ 1.9
Unrecognized compensation expense | $ | $ 13.0 |  |  | $ 13.0 |  |  | $ 13.0 |
Unrecognized compensation expense, period for recognition (in years) |  |  |  |  |  |  | 2 years 8 months 12 days |
Long-Term Incentive Plan Units and Restricted Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ |  |  |  |  |  |  | $ 6.6 |
Expected term |  |  |  |  |  |  | 3 years |
Risk free interest rate |  |  |  |  |  |  | 0.80% |
Expected volatility rate |  |  |  |  |  |  | 24.00% |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Granted, Weighted Average Grant Price, per share | $ / shares |  |  |  |  |  |  | $ 13.36 |
Long-Term Incentive Plan Unit [Member] |  |  |  |  |  |  |  |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance, Unvested (in shares) |  |  | 1,194,660 |  | 1,194,660 |  | 1,194,660 |
Vested (in shares) |  |  |  |  |  |  | (59,875) |
Granted (in shares) |  |  |  |  |  |  | 461,180 |
Forfeited (in shares) |  |  |  |  |  |  | (1,108) |
Ending balance, Unvested (in shares) | 1,594,857 |  |  | 1,594,857 |  |  | 1,594,857 |
Time Based Long-Tern Incentive Plan Unit |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ |  | $ 0.8 |  |  |  |  |  |
Award vesting period (in years) |  | 4 years |  |  |  |  |  |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) |  | 33,398 |  |  |  |  |  |
Performance Based Long-Term Incentive Plan Unit |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ |  | $ 0.4 |  |  |  |  |  |
Number of Vesting Installments | tranche |  | 2 |  |  |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |  |  |  |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) |  | 33,398 |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Expected term |  |  |  |  |  |  | 2 years 10 months 24 days |
Risk free interest rate |  |  |  |  |  |  | 1.00% |
Expected volatility rate |  |  |  |  |  |  | 29.00% |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance, Unvested (in shares) |  |  | 102,296 |  | 102,296 |  | 102,296 |
Vested (in shares) |  |  |  |  |  |  | (6,261) |
Granted (in shares) |  |  |  |  |  |  | 30,020 |
Forfeited (in shares) |  |  |  |  |  |  | (6,397) |
Ending balance, Unvested (in shares) | 119,658 |  |  | 119,658 |  |  | 119,658 |
Long-Term Incentive Plan Unit and Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Dividend rate |  |  |  |  |  |  | 1.90% |
Director |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Annual forfeiture rate, percent |  |  |  |  |  |  | 0.00 |
Director | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units Vesting February 2018 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ | $ 0.6 |  |  |  |  |  |  |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) | 35,082 |  |  |  |  |  |  |
Executive Officer |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Annual forfeiture rate, percent |  |  |  |  |  |  | 0.00 |
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units Vesting January 2018 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ |  | $ 2.9 |  |  |  |  |  |
Award vesting period (in years) |  | 4 years |  |  |  |  |  |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) |  | 168,033 |  |  |  |  |  |
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units Vesting February 2018 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ |  | $ 0.2 |  |  |  |  |  |
Award vesting period (in years) |  | 4 years |  |  |  |  |  |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) |  | 13,736 |  |  |  |  |  |
Executive Officer | Performance Based Long-Term Incentive Plan Unit | 2013 Plan Units Vesting January 2018 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ |  | $ 1.3 |  |  |  |  |  |
Number of Vesting Installments | tranche |  | 2 |  |  |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |  |  |  |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) |  | 154,266 |  |  |  |  |  |
Executive Officer | Performance Based Long-Term Incentive Plan Unit | 2013 Plan Units Vesting February 2018 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ |  | $ 0.1 |  |  |  |  |  |
Number of Vesting Installments | vesting_installment |  | 2 |  |  |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |  |  |  |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) |  | 13,736 |  |  |  |  |  |
Other Employees | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units Vesting February 2018 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ |  |  |  |  |  |  | $ 0.1 |
ESRT | Performance Restricted Shares |  |  |  |  |  |  |  |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) |  | 14,315 |  |  |  |  |  |
ESRT | Time Restricted Shares |  |  |  |  |  |  |  |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) |  | 14,315 |  |  |  |  |  |
2013 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized under the plan | 12,200,000.0 |  |  | 12,200,000.0 |  |  | 12,200,000.0 |
Number of shares that remain available for future issuance | 10,200,000.0 |  |  | 10,200,000.0 |  |  | 10,200,000.0 |
2013 Plan | Time Based Long-Tern Incentive Plan Unit |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Fair value of share-based awards granted in period | $ |  |  | $ 0.2 |  |  |  |  |
Restricted Stock and LTIP Unit Activity [Roll Forward] |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 9,531 |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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