Organization	12 Months Ended
Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization On December 1, 2015, Stock Building Supply Holdings, Inc. (“SBS”) completed a business combination with privately-held Building Materials Holding Corporation (“BMC”) in accordance with the terms of the Agreement and Plan of Merger, dated as of June 2, 2015, by and between SBS and BMC (the “Merger Agreement”), pursuant to which BMC merged with and into SBS (the “Merger”). As a result of the business combination, SBS survived the Merger and in connection therewith changed its name to “BMC Stock Holdings, Inc.” These financial statements represent the financial statements of BMC Stock Holdings, Inc., and its subsidiaries. All references to “BMC Stock,” “we,” “us,” “our” or the “Company” in this Annual Report on Form 10-K mean BMC Stock Holdings, Inc. Under U.S. generally accepted accounting principles ("U.S. GAAP"), the Merger is treated as a “reverse merger” under the acquisition method of accounting. For accounting purposes, BMC is considered to have acquired SBS. Consequently, the historical financial statements of the Company reflect only the operations and financial condition of BMC prior to the date of the Merger. The operating results of SBS are reported as part of the Company beginning on the closing date of the Merger.

Organization

12 Months Ended

Dec. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

On December 1, 2015, Stock Building Supply Holdings, Inc. (“SBS”) completed a business combination with privately-held Building Materials Holding Corporation (“BMC”) in accordance with the terms of the Agreement and Plan of Merger, dated as of June 2, 2015, by and between SBS and BMC (the “Merger Agreement”), pursuant to which BMC merged with and into SBS (the “Merger”). As a result of the business combination, SBS survived the Merger and in connection therewith changed its name to “BMC Stock Holdings, Inc.”

These financial statements represent the financial statements of BMC Stock Holdings, Inc., and its subsidiaries. All references to “BMC Stock,” “we,” “us,” “our” or the “Company” in this Annual Report on Form 10-K mean BMC Stock Holdings, Inc.

Under U.S. generally accepted accounting principles ("U.S. GAAP"), the Merger is treated as a “reverse merger” under the acquisition method of accounting. For accounting purposes, BMC is considered to have acquired SBS. Consequently, the historical financial statements of the Company reflect only the operations and financial condition of BMC prior to the date of the Merger. The operating results of SBS are reported as part of the Company beginning on the closing date of the Merger.