The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Related Party Transactions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended						6 Months Ended	12 Months Ended
	Jun. 30, 2012	Jul. 01, 2011	Jun. 30, 2012 Armand Products Company	Jul. 01, 2011 Armand Products Company	Jun. 30, 2012 Armakleen Company	Jul. 01, 2011 Armakleen Company	Jun. 30, 2012 Natronx LLC ton	Dec. 31, 2011 Natronx LLC
Related Party Transaction [Line Items]
Percentage of ownership interest			50.00%	50.00%	50.00%	50.00%	33.33%
Expected future investment in JV							$ 60.0
Expected annual trona sorbents production, tons per year							450,000
Initial investment of joint venture	6.8	0					6.8	3.2
Additional committed investment in joint venture							$ 10