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Partners' Capital of the Operating Partnership (Details)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Common Stock        
Stockholders' Equity        
Units outstanding (units) 97,325,000us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 94,993,000us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 91,250,000us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 85,783,000us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
SL Green Operating Partnership        
Stockholders' Equity        
Noncontrolling interest in the operating partnership (as a percent) 3.92%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember		 2.96%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember		    
Number of units of operating partnership owned by the noncontrolling interest unit holders (units) 3,973,016slg_MinorityInterestUnitsOfPartnershipOwnedByNoncontrollingOwners
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember		 2,902,317slg_MinorityInterestUnitsOfPartnershipOwnedByNoncontrollingOwners
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember		    
SL Green Operating Partnership | Series I Preferred Units        
Stockholders' Equity        
Units outstanding (units) 9,200,000us-gaap_SharesOutstanding
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		      
SL Green Operating Partnership | Common Stock        
Stockholders' Equity        
Units outstanding (units) 97,325,200us-gaap_SharesOutstanding
/ dei_LegalEntityAxis
= us-gaap_PartnershipInterestMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember