Financial Instruments and Fair Values - Schedule of Carrying and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in accounts payable and accrued expenses	$ 0	$ 85
Carrying Value \| Unsecured term loan facilities \| Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	268,731	389,286
Carrying Value \| Unsecured revolving credit facility \| Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	120,000
Carrying Value \| Fixed rate mortgage debt:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	692,176	877,388
Carrying Value \| Senior Notes \| Senior unsecured notes - Series A-K
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	1,197,061
Carrying Value \| Senior Notes \| Senior unsecured notes - Series A-H
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		973,872
Carrying Value \| Interest Rate Swap and Interest Rate Cap
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	13,098	11,800
Carrying Value \| Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in accounts payable and accrued expenses		85
Estimated Fair Value \| Unsecured term loan facilities \| Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	270,000	390,000
Estimated Fair Value \| Unsecured revolving credit facility \| Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	120,000
Estimated Fair Value \| Fixed rate mortgage debt:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	618,378	774,280
Estimated Fair Value \| Senior Notes \| Senior unsecured notes - Series A-K
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	1,116,149
Estimated Fair Value \| Senior Notes \| Senior unsecured notes - Series A-H
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		882,242
Estimated Fair Value \| Level 1 \| Unsecured term loan facilities \| Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Estimated Fair Value \| Level 1 \| Unsecured revolving credit facility \| Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0
Estimated Fair Value \| Level 1 \| Fixed rate mortgage debt:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Estimated Fair Value \| Level 1 \| Senior Notes \| Senior unsecured notes - Series A-K
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0
Estimated Fair Value \| Level 1 \| Senior Notes \| Senior unsecured notes - Series A-H
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		0
Estimated Fair Value \| Level 2 \| Unsecured term loan facilities \| Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Estimated Fair Value \| Level 2 \| Unsecured revolving credit facility \| Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0
Estimated Fair Value \| Level 2 \| Fixed rate mortgage debt:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Estimated Fair Value \| Level 2 \| Senior Notes \| Senior unsecured notes - Series A-K
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0
Estimated Fair Value \| Level 2 \| Senior Notes \| Senior unsecured notes - Series A-H
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		0
Estimated Fair Value \| Level 3 \| Unsecured term loan facilities \| Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	270,000	390,000
Estimated Fair Value \| Level 3 \| Unsecured revolving credit facility \| Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	120,000
Estimated Fair Value \| Level 3 \| Fixed rate mortgage debt:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	618,378	774,280
Estimated Fair Value \| Level 3 \| Senior Notes \| Senior unsecured notes - Series A-K
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	1,116,149
Estimated Fair Value \| Level 3 \| Senior Notes \| Senior unsecured notes - Series A-H
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value		882,242
Estimated Fair Value \| Interest Rate Swap and Interest Rate Cap
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	13,098	11,800
Estimated Fair Value \| Interest Rate Swap and Interest Rate Cap \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	0	0
Estimated Fair Value \| Interest Rate Swap and Interest Rate Cap \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	13,098	11,800
Estimated Fair Value \| Interest Rate Swap and Interest Rate Cap \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	$ 0	0
Estimated Fair Value \| Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in accounts payable and accrued expenses		85
Estimated Fair Value \| Interest rate swaps \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in accounts payable and accrued expenses		0
Estimated Fair Value \| Interest rate swaps \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in accounts payable and accrued expenses		85
Estimated Fair Value \| Interest rate swaps \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in accounts payable and accrued expenses		$ 0

Empire State Realty OP, L.P. 10-K