Summary of Significant Accounting Policies and Procedures - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) State Customer Agreement Segment Center	Dec. 31, 2014 USD ($) Segment	Dec. 31, 2013 USD ($)
Business And Summary Of Significant Accounting Policies [Line Items]
Number of distribution centers | Center	26
Number of states in which products are distributed | State	41
Allowance for doubtful accounts days	90 days
Inventory valuation LIFO method	91.00%	91.00%
FIFO cost higher than LIFO valuation	$ 13.6	$ 12.9
Company recorded depreciation expense	2.9	3.0	$ 2.7
Shipping and handling products cost	$ 28.8	$ 30.3	$ 28.4
Percentage of consolidated revenues of company's top ten clients	40.00%
Number of major customers | Customer	10
Percentage of employees represented under collective bargaining agreements		14.00%
Number of collective bargaining agreements | Agreement	8
Percentage of employees covered under four expiring collective bargaining agreements	8.00%
Number of collective bargaining agreements expired in next year | Agreement	3
Collective bargaining agreements expiration period	2016
Aggregate number of reporting segment | Segment	1	1
Major Customer [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Total sales in percentage	13.00%	12.00%	12.00%
Maximum [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Original maturity of cash equivalents	All highly liquid interest-earning investments with an original maturity of three months or less at the date of purchase
Maximum [Member] | Building and Building Improvements [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Buildings and improvements lives	25 years
Maximum [Member] | Machinery and Equipment [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Buildings and improvements lives	10 years
Minimum [Member] | Building and Building Improvements [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Buildings and improvements lives	3 years
Minimum [Member] | Machinery and Equipment [Member]
Business And Summary Of Significant Accounting Policies [Line Items]
Buildings and improvements lives	3 years