Basis of Presentation and Description of Company	3 Months Ended
Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Description of Company	1. Basis of Presentation and Description of Company PCM, Inc. is a leading multi-vendor provider of technology products, services and solutions offered through our dedicated sales force, field and internal service teams, direct marketing channels and state of the art owned and operated data centers. Since our founding in 1987, we have served our customers by offering products and services from vendors such as Adobe, Apple, Cisco, Dell, Hewlett Packard Enterprise, HP Inc., Lenovo, Microsoft, Oracle, Samsung, Symantec and VMware. We add additional value by incorporating products and services into comprehensive solutions. Our sales and marketing efforts allow our vendor partners to reach multiple customer segments including small, medium and enterprise businesses, state, local and federal governments and educational institutions. We have prepared the unaudited condensed consolidated financial statements included herein pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) and in conformity with accounting principles generally accepted in the United States of America, or GAAP, which requires us to make estimates and assumptions that affect amounts reported herein. We base our estimates and assumptions on historical experience and on various other factors that we believe to be reasonable under the circumstances. Due to the inherent uncertainty involved in making estimates, our actual results reported in future periods may be affected by changes in those estimates. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations for interim financial reporting. In the opinion of management, all adjustments, consisting only of normal recurring items which are necessary for a fair presentation, have been included. The results for interim periods are not necessarily indicative of the results that may be expected for any other interim period or for the full year. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2015 filed with the SEC. In February 2016, we transitioned out nearly the entire management overhead of our MacMall business, thinned out its cost structure and brought it under the management and supervision of our Commercial segment. Also, in connection with our acquisitions of Acrodex and certain assets of Systemax’s North American Technology Group in the fourth quarter of 2015 and our resulting entrance into selling products, services and solutions in the Canadian market, we formed a new operating segment called Canada. This segment includes our operations related to these Canadian market activities, beginning as of the respective dates of these acquisitions. As a result, beginning in 2016, we have the following three operating segments: Commercial, Public Sector and Canada. We discontinued the operation of all four of our retail stores, located in Huntington Beach, Santa Monica and Torrance, California and Chicago, Illinois, and our OnSale and eCost businesses in 2014. We reflected the results of these operations, which were historically reported as a part of our MacMall segment, as discontinued operations for all periods presented herein in our Consolidated Balance Sheets and Consolidated Statements of Operations. We sell primarily to customers in the United States and Canada, and maintain offices in the United States and Canada, as well as in Manila, Philippines. In the three months ended March 31, 2016, we generated approximately 77% of our revenue in our Commercial segment, 15% of our revenue in our Public Sector segment and 8% of our revenue in our Canada segment. Our Commercial segment sells complex products, services and solutions to commercial businesses in the United States, using multiple sales channels, including a field relationship-based selling model, an outbound phone based sales force, a field services organization and online extranets. Our Public Sector segment consists of sales made primarily to federal, state and local governments, as well as educational institutions. The Public Sector segment utilizes an outbound phone and field relationship-based selling model, as well as contract and bid business development teams and an online extranet. Our Canada segment consists of sales made to customers in the Canadian market beginning as of the respective dates of our acquisition of Acrodex and certain assets of Systemax in October and December 2015, respectively.

Basis of Presentation and Description of Company

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Description of Company

1. Basis of Presentation and Description of Company

PCM, Inc. is a leading multi-vendor provider of technology products, services and solutions offered through our dedicated sales force, field and internal service teams, direct marketing channels and state of the art owned and operated data centers. Since our founding in 1987, we have served our customers by offering products and services from vendors such as Adobe, Apple, Cisco, Dell, Hewlett Packard Enterprise, HP Inc., Lenovo, Microsoft, Oracle, Samsung, Symantec and VMware. We add additional value by incorporating products and services into comprehensive solutions. Our sales and marketing efforts allow our vendor partners to reach multiple customer segments including small, medium and enterprise businesses, state, local and federal governments and educational institutions.

We have prepared the unaudited condensed consolidated financial statements included herein pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) and in conformity with accounting principles generally accepted in the United States of America, or GAAP, which requires us to make estimates and assumptions that affect amounts reported herein. We base our estimates and assumptions on historical experience and on various other factors that we believe to be reasonable under the circumstances. Due to the inherent uncertainty involved in making estimates, our actual results reported in future periods may be affected by changes in those estimates. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations for interim financial reporting. In the opinion of management, all adjustments, consisting only of normal recurring items which are necessary for a fair presentation, have been included. The results for interim periods are not necessarily indicative of the results that may be expected for any other interim period or for the full year. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2015 filed with the SEC.

In February 2016, we transitioned out nearly the entire management overhead of our MacMall business, thinned out its cost structure and brought it under the management and supervision of our Commercial segment. Also, in connection with our acquisitions of Acrodex and certain assets of Systemax’s North American Technology Group in the fourth quarter of 2015 and our resulting entrance into selling products, services and solutions in the Canadian market, we formed a new operating segment called Canada. This segment includes our operations related to these Canadian market activities, beginning as of the respective dates of these acquisitions. As a result, beginning in 2016, we have the following three operating segments: Commercial, Public Sector and Canada.

We discontinued the operation of all four of our retail stores, located in Huntington Beach, Santa Monica and Torrance, California and Chicago, Illinois, and our OnSale and eCost businesses in 2014. We reflected the results of these operations, which were historically reported as a part of our MacMall segment, as discontinued operations for all periods presented herein in our Consolidated Balance Sheets and Consolidated Statements of Operations.

We sell primarily to customers in the United States and Canada, and maintain offices in the United States and Canada, as well as in Manila, Philippines. In the three months ended March 31, 2016, we generated approximately 77% of our revenue in our Commercial segment, 15% of our revenue in our Public Sector segment and 8% of our revenue in our Canada segment.

Our Commercial segment sells complex products, services and solutions to commercial businesses in the United States, using multiple sales channels, including a field relationship-based selling model, an outbound phone based sales force, a field services organization and online extranets.

Our Public Sector segment consists of sales made primarily to federal, state and local governments, as well as educational institutions. The Public Sector segment utilizes an outbound phone and field relationship-based selling model, as well as contract and bid business development teams and an online extranet.

Our Canada segment consists of sales made to customers in the Canadian market beginning as of the respective dates of our acquisition of Acrodex and certain assets of Systemax in October and December 2015, respectively.