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Partners' Capital of the Operating Partnership - EPS (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Stockholders' Equity    
Income attributable to SL Green common stockholders $ 43,277us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 146,090us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic weighted average common shares outstanding (shares) 98,402,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 95,117,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Common stock shares excluded from the diluted shares outstanding (shares) 203,975us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 860,720us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
SL Green Operating Partnership    
Stockholders' Equity    
Income attributable to SL Green common stockholders $ 45,020us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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$ 150,819us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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Basic weighted average common shares outstanding (shares) 102,366,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
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98,196,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
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Stock-based compensation plans (shares) 653,000slg_IncrementalCommonUnitsAttributabletoSharebasedPaymentArrangements
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520,000slg_IncrementalCommonUnitsAttributabletoSharebasedPaymentArrangements
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Diluted weighted average common units outstanding (shares) 103,019,000slg_WeightedAverageNumberofUnitsOutstandingDiluted
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
98,716,000slg_WeightedAverageNumberofUnitsOutstandingDiluted
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
Common stock shares excluded from the diluted shares outstanding (shares) 203,975us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
860,720us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember