v2.4.1.9

Equity Investments (Notes) | 12 Months Ended
--- | ---
Dec. 31, 2014
Equity Investments [Abstract] |
Equity Method Investments and Joint Ventures Disclosure [Text Block] |
15. | Equity Investments
On November 10, 2014, the Company acquired a 35% non-controlling interest in Kelway, a UK-based IT solutions provider, which has global supply chain relationships that enable it to conduct business in over 100 countries. The Company paid $86.8 million to acquire its ownership interest in Kelway, with the option to purchase the remaining 65% between June 2015 and June 2017. The Company accounts for its investment in Kelway using the equity method. As of December 31, 2014, the amount assigned to goodwill and definite-lived intangible assets related to the Company's 35% non-controlling equity investment in Kelway was $119.2 million, which represented the excess of the purchase price plus liabilities assumed less tangible assets acquired.

X
- Details
Name: | cdw_EquityInvestmentsAbstract
Namespace Prefix: | cdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=35687916&loc=d3e32787-111569 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=35687916&loc=d3e32847-111569 + Details
Name: | us-gaap_EquityMethodInvestmentsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration