Property and Equipment Estimated Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2014
Buildings and improvements | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	12 years
Buildings and improvements | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	40 years
Warehouse and office equipment | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	5 years
Warehouse and office equipment | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	7 years
Automobiles | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	3 years
Automobiles | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	5 years