Basis of Presentation - Additional Information (Detail) (USD $)	6 Months Ended		6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 CPO Commerce, Inc [Member]	May 30, 2014 CPO Commerce, Inc [Member]
Basis Of Presentation [Line Items]
Percentage of LIFO Inventory	75.00%	76.00%
LIFO Inventory Amount	$ 114,000,000	$ 112,400,000
Inventory, LIFO Reserve, Effect on Income, Net	1,600,000
Effect of LIFO Inventory Liquidation on Income	3,400,000
Inventory, LIFO Reserve, Period Charge	5,000,000
Stock acquisition, percentage acquired				100.00%
Business acquisition cash paid			38,900,000
Amount payable related to an CPO acquisition			51,000
Indemnification period during acquisition			3 months
Business acquisition, fair value of contingent consideration			6,700,000
Business acquisition contingent consideration payments, range minimum			0
Business acquisition contingent consideration payments, range maximum			$ 10,000,000