Segment and Geographic Information - Net Sales by Product or Service Type for North America, EMEA and APAC (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue from External Customer [Line Items]
Revenues from external customers	$ 1,395,158	$ 1,151,020	$ 1,416,547	$ 1,181,622	$ 1,346,675	$ 1,181,409	$ 1,529,175	$ 1,244,182	$ 5,144,347	$ 5,301,441	$ 5,287,228
North America [Member]
Revenue from External Customer [Line Items]
Revenues from external customers									3,470,760	3,626,357	3,672,492
North America [Member] | Hardware Net Sales [Member]
Revenue from External Customer [Line Items]
Revenues from external customers									2,130,006	2,238,363	2,334,257
North America [Member] | Software Net Sales [Member]
Revenue from External Customer [Line Items]
Revenues from external customers									1,129,114	1,177,538	1,095,532
North America [Member] | Services Net Sales [Member]
Revenue from External Customer [Line Items]
Revenues from external customers									211,640	210,456	242,703
EMEA [Member]
Revenue from External Customer [Line Items]
Revenues from external customers									1,469,174	1,463,607	1,398,421
EMEA [Member] | Hardware Net Sales [Member]
Revenue from External Customer [Line Items]
Revenues from external customers									504,006	540,886	438,171
EMEA [Member] | Software Net Sales [Member]
Revenue from External Customer [Line Items]
Revenues from external customers									930,903	894,949	936,543
EMEA [Member] | Services Net Sales [Member]
Revenue from External Customer [Line Items]
Revenues from external customers									34,265	27,772	23,707
APAC [Member]
Revenue from External Customer [Line Items]
Revenues from external customers									204,413	211,477	216,315
APAC [Member] | Hardware Net Sales [Member]
Revenue from External Customer [Line Items]
Revenues from external customers									6,222	4,820	1,647
APAC [Member] | Software Net Sales [Member]
Revenue from External Customer [Line Items]
Revenues from external customers									191,355	199,239	208,200
APAC [Member] | Services Net Sales [Member]
Revenue from External Customer [Line Items]
Revenues from external customers									$ 6,836	$ 7,418	$ 6,468