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Accounts Receivable Securitization Program - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
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Sep. 30, 2012 | Dec. 31, 2011
Maximum purchase limit for receivable interests under Accounts Receivable Securitization Program | $ 125 |  |  |
Accounts receivable securitization program expiration date | 2012-12 |  |  |
Accounts receivable securitization program extended maturity period | 2013-09 |  |  |
Amount available for accounts receivable securitization program | 118.0 | [1] | 92.0 | [1]
Level of eligible assets available under accounts receivable securitization program | Less than $125 million |  |  |
Amount outstanding under accounts receivable securitization program | $ 0 |  | $ 0 |
[1] | See Note 9, "Accounts Receivable Securitization Program," for further details of this program.

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- Definition Level of eligible assets available under accounts receivable securitization program. + References No definition available. + Details
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- Definition This includes both the securitized and unsecuritized portion of the total principal amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 17 -Subparagraph i(4) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB Staff Position (FSP) -Number FAS140-4/FIN46(R)-8 -Paragraph B11 -Subparagraph b(1)(b), b(6) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719 + Details
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