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Commitments and Contingencies Major Customers and Other Concentrations (Details) (Predecessor [Member], Sales Revenue, Services, Net [Member])	9 Months Ended
	Sep. 30, 2013 tenant	Sep. 30, 2012 tenant
Concentration Risk [Line Items]
Number of properties	3	3
Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Number of tenants	3	3
Customer Concentration Risk [Member] | One Grand Central Place [Member]
Concentration Risk [Line Items]
Concentration risk percentage	27.30%	27.34%
Customer Concentration Risk [Member] | First Stamford Place [Member]
Concentration Risk [Line Items]
Concentration risk percentage	14.91%	15.83%
Customer Concentration Risk [Member] | 250 West 57th Street [Member]
Concentration Risk [Line Items]
Concentration risk percentage	11.77%	11.71%
Customer Concentration Risk [Member] | Major Tenant Three [Member]
Concentration Risk [Line Items]
Concentration risk percentage	10.42%	11.77%
Customer Concentration Risk [Member] | Customer 1 [Member]
Concentration Risk [Line Items]
Concentration risk percentage	3.44%	4.83%
Customer Concentration Risk [Member] | Customer 2 [Member]
Concentration Risk [Line Items]
Concentration risk percentage	3.45%	3.32%
Customer Concentration Risk [Member] | Customer 3 [Member]
Concentration Risk [Line Items]
Concentration risk percentage	3.53%	3.62%

X

- Definition

Concetration Risk, Number of Tenants

+ References

No definition available.

+ Details

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Namespace Prefix:	esrt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_ConcentrationRiskLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant