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Commitments and Contingencies - Litigation (Details) | Oct. 14, 2014 participant | Sep. 04, 2013 participant | May. 17, 2013 USD ($) participant | Jan. 28, 2013 participant | Sep. 28, 2012 USD ($) llc | Mar. 14, 2014 participant | Dec. 24, 2013 claim | Jun. 20, 2013 participant | Mar. 31, 2012 claim
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Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of additional investors who apposed the settlement |  |  |  |  |  |  |  | 1 |
Number of investors who had filed a notice of appeal |  |  |  |  |  | 1 |  |  |
New York State Supreme Court, New York County |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of plaintiffs opting out of settlement | 12 |  |  |  |  |  |  |  |
Pending Litigation | New York State Supreme Court, New York County |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of claims | claim |  |  |  |  |  |  | 4 |  |
Number of plaintiffs | 4,500 |  |  |  |  |  |  |  |
Predecessor | New York State Supreme Court, New York County |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Damages awarded | $ |  |  |  |  | $ 55,000,000 |  |  |  |
Percent of damages awarded required to be in cash |  |  |  |  | 80.00% |  |  |  |
Number of LLC's | llc |  |  |  |  | 3 |  |  |  |
Maximum difference between exchange value and prospectus statement |  |  |  |  | 10.00% |  |  |  |
Proceeds from issuance of common stock threshold amount of consolidation considerations | $ |  |  |  |  | $ 600,000,000.0 |  |  |  |
Number of plaintiffs opting out of settlement |  | 2 | 12 |  |  |  |  |  |
Attorney fees sought | $ |  |  | $ 15,000,000 |  |  |  |  |  |
Attorney expenses sought | $ |  |  | 295,895 |  |  |  |  |  |
Attorney fees awarded | $ |  |  | 11,590,000 |  |  |  |  |  |
Attorney expenses awarded | $ |  |  | $ 265,282 |  |  |  |  |  |
Predecessor | New York State Supreme Court, New York County | ESRT |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Maximum percent of freely-tradable common stock or partnership units |  |  |  |  | 20.00% |  |  |  |
Predecessor | Pending Litigation |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  | 6 |  |  |  |  |
Predecessor | Pending Litigation | New York State Supreme Court, New York County |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of claims | claim |  |  |  |  |  |  |  |  | 5
Number of plaintiffs |  |  | 4,500 | 6 |  |  |  |  |

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