Description of Business	9 Months Ended
Description of Business	Sep. 30, 2012
Description Of Business [Abstract]
Description of Business	1. Description of Business SG Blocks, Inc. (the “Company”) was previously known as CDSI Holdings, Inc. (a Delaware corporation incorporated on December 29, 1993). On November 4, 2011, the Company’s wholly-owned subsidiary was merged with and into SG Building Blocks, Inc. (“SG Building”, formerly SG Blocks Inc.) (the “Merger”), with SG Building surviving the Merger and becoming a wholly-owned subsidiary of the Company. The Merger was a reverse merger that was accounted for as a recapitalization of SG Building as SG Building is the accounting acquirer. Accordingly, the historical financial statements presented are the financial statements of SG Building. During 2012, the Company formed SG Blocks Sistema De Constucao Brasileiro LTDA. (“SG Brazil”), a wholly owned subsidiary of the Company. The Company formed SG Brazil in order to actively explore opportunities in Brazil. The Company is a provider of code engineered cargo shipping containers modified for use in “green” construction. The Company also provides engineering and project management services related to the use of modified containers in construction.

The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

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