Description of Company	12 Months Ended
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Company	1. Description of Company PCM, Inc. is a leading multi-vendor provider of technology solutions, including hardware products, software and services, offered through our dedicated sales force, ecommerce channels and technology services teams. 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, Symantec and VMware. We provide our customers with comprehensive solutions incorporating leading products and services across a variety of technology practices and platforms such as cloud, security, data center, networking, collaboration and mobility. 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. In connection with our entrance into the UK market in the first quarter of 2017 with the formation of PCM Technology Solutions UK, Ltd (“PCM UK”), we formed a new operating segment called United Kingdom. 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, which are both described more fully below in Note 3, and our resulting entrance into selling technology solutions in the Canadian market, we formed a new operating segment called Canada, which includes our operations related to these Canadian market activities. As a result, we operate in four reportable segments: Commercial, Public Sector, Canada and United Kingdom. Our reportable operating segments are primarily aligned based upon our reporting of results as used by our chief operating decision maker in evaluating the operating results and performance of our company. We include corporate related expenses such as legal, accounting, information technology, product management and other administrative costs that are not otherwise included in our reportable operating segments in Corporate & Other. All historical segment financial information provided herein has been revised to reflect our revised reportable operating segments. We sell primarily to customers in the United States, Canada and the UK, and maintain offices in the United States, Canada and the UK, as well as in the Philippines. In 2018, we generated approximately 76% of our revenue in our Commercial segment, 12% of our revenue in our Public Sector segment, 9% of our revenue in our Canada segment and 3% of our revenue in our United Kingdom segment. Our Commercial segment sells complex technology 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, as well as the acquisition of Stratiform in December 2016. Our United Kingdom segment consists of results of our UK subsidiary, PCM UK, and its wholly-owned subsidiaries, which serve as our hub for the UK and the rest of Europe.

Description of Company

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

1. Description of Company

PCM, Inc. is a leading multi-vendor provider of technology solutions, including hardware products, software and services, offered through our dedicated sales force, ecommerce channels and technology services teams. 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, Symantec and VMware. We provide our customers with comprehensive solutions incorporating leading products and services across a variety of technology practices and platforms such as cloud, security, data center, networking, collaboration and mobility. 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.

In connection with our entrance into the UK market in the first quarter of 2017 with the formation of PCM Technology Solutions UK, Ltd (“PCM UK”), we formed a new operating segment called United Kingdom. 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, which are both described more fully below in Note 3, and our resulting entrance into selling technology solutions in the Canadian market, we formed a new operating segment called Canada, which includes our operations related to these Canadian market activities. As a result, we operate in four reportable segments: Commercial, Public Sector, Canada and United Kingdom. Our reportable operating segments are primarily aligned based upon our reporting of results as used by our chief operating decision maker in evaluating the operating results and performance of our company. We include corporate related expenses such as legal, accounting, information technology, product management and other administrative costs that are not otherwise included in our reportable operating segments in Corporate & Other. All historical segment financial information provided herein has been revised to reflect our revised reportable operating segments.

We sell primarily to customers in the United States, Canada and the UK, and maintain offices in the United States, Canada and the UK, as well as in the Philippines. In 2018, we generated approximately 76% of our revenue in our Commercial segment, 12% of our revenue in our Public Sector segment, 9% of our revenue in our Canada segment and 3% of our revenue in our United Kingdom segment.

Our Commercial segment sells complex technology 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, as well as the acquisition of Stratiform in December 2016.

Our United Kingdom segment consists of results of our UK subsidiary, PCM UK, and its wholly-owned subsidiaries, which serve as our hub for the UK and the rest of Europe.