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v2.4.0.6

Restriction on Distribution of Net Assets from Subsidiary - Additional Information (Detail) (WMMRC [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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WMMRC [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Total net assets | $ 167.1 | $ 167.0

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- Definition The net of assets and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Paragraph 19 -Article 6 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 225 -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09.6,7) -URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606914-122999 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 2 -Subparagraph (SX 210.6-05.4) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e604008-122996 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 05 -Paragraph 4 -Article 6 + Details
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