Geographic Data - Net Sales by Major Product Category (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Sales Revenue By Business Segment [Line Items]
Total net sales	$ 1,038,159	$ 996,168	$ 983,488
Hardware [Member]
Schedule Of Sales Revenue By Business Segment [Line Items]
Total net sales	735,123	730,489	743,308
Supplies [Member]
Schedule Of Sales Revenue By Business Segment [Line Items]
Total net sales	243,965	212,499	187,457
Service and Software [Member]
Schedule Of Sales Revenue By Business Segment [Line Items]
Total net sales	53,627	47,941	47,206
Shipping and Handling [Member]
Schedule Of Sales Revenue By Business Segment [Line Items]
Total net sales	$ 5,444	$ 5,239	$ 5,517