Equity - Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Numerator:
Net income attributable to Empire State Realty Trust, Inc. - basic and diluted	$ 9,834	$ 14,203
Denominator:
Weighted average shares outstanding - basic (in shares)	95,573,000	95,574,000
Effective of dilutive securities - share-based compensation	42,000	42,000
Weighted average shares outstanding - dilutive	95,615,000	95,616,000
Basic	$ 0.10	$ 0.15
Diluted	$ 0.10	$ 0.15
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0