Summary of Significant Accounting Policies - Shipping and Handling Costs Included in Net Sales and Selling, General and Administrative Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Chemical [Member]
Components Of Other Operating Cost And Expense [Line Items]
Shipping costs-Net sales	$ 28,736	$ 21,954	$ 23,395
Handling costs-SG&A	5,481	5,437	5,746
Climate Control [Member]
Components Of Other Operating Cost And Expense [Line Items]
Shipping and handling costs-SG&A	$ 10,146	$ 9,520	$ 8,897