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Summary of Carrying Amount and Fair Value of Financial Instruments (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Carrying Amounts and Fair Values of Financial Instruments [Line Items] |  |
Long term debt and capital lease obligations | $ 6.1 | $ 4.7

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- Definition Obligation related to long-term debt (excluding convertible debt) and capital leases, the portion which is due in one year or less in the future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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